LSR Pro Stock  2-1's

No stupid megaphones; 15 Degree Merge Collector; CNC Billet Turbo Venturies, Billett Gaskets

Anatomy of a Racing Bagger Exhaust

LSR 2-1 Pro Stock 1306R : i.e. Our 00-1306 Pro Stock Challenge with Db reducing resonator. TC 124" S&S Dresser headed for Dual Coat Black Ceramic Coating.

Full 2" Primaries 27" Rear, 32" Front with 19" Secondary. CNC Billett Turbo Venturies exit 1.800" into 1.875" I.D. of 2" Primaries.

2.500" O.D., 2.375" I.D. Secondary with Resonator 2.500" I.D. Length 20". Total Rear Pulse 47". Total Front Pulse 52".

Termination Rear Axle. No bag heating issues.

Rear Primary slip joint. Front Primary Slip Joint.

Since 1978 building rubber-mounted Harley FL exhausts and brackets that do not break....Shovels to M8's.

Extended Closed TC Dresser Bags..,1306R w/45 Deg Turn Down

LSR 2-1 Pro Stock 1306custom made for a 131" 2012 Twin Cam Bagger that has extended, lowered, and closed bags. Wide open Pro Stock, zero restriction, with sound attenuation. Resonator hidden under the bags.

00-1306RSD LSR 2-1 Pro Stock Challenge. Shorter Secondary for higher RPM.


Customer Writes: " Hello I have been running my rb racing exhaust for the last year and absolutely love it .I have been competing in local drag racing events with this bike and how this pipe performs, sounds , and has held up in comparison to others is amazing.

I am pushing about 160 hp as well as 160 lb-ft with smooth acceleration and no hard dips in my tune like I saw with other exhausts plus I get compliments on how it looks quite frequently thank you again. Dustin BSMC.”

00-1306 2012 Blackline


Customer Writes: "
Hey all, just wanted to share a pic with you guys of your LSR on my 2012 HD Blackline FXS project, The Blue Collar Blackline featured at Iron Trader News. I absolutely love this pipe! The look, the sound and the power. It's a head turner for sure. Idling in to a bike night, the sound from a high compression 110 build with big cams turns heads. The haze of tire smoke when leaving shows that it makes power to match the sound. 

Love your work, and what you have built! Dave."

145 S&S 00-1278

Customer Writes: " I have finally gotten the exhaust on the bike. Attached, please find a picture that I took last weekend. Everything fit perfectly. Thank you for such a well-made part. Jason ".

LSR 2-1 Pro Stock B Style for a 1" taller 145 Cubic Inch S&S motor with offset for wide swing arm. Left side drive. # 00-1278

Kiwi 00-1052 FXR

Customer Writes: " Hey guys. Hope you’re well! I LOVE my new pipe thank you so much.  Hope you’re having a great weekend Best...Rene".

Down Under LSR Click to view run

Customer Writes: " Hey guys just checking in to say a huge thank you from us over here in Australia.

As you would be aware we campaign a bike at DLRA speed week

With the help of Jason (legend )and You guys being  generous and to give us an exhaust we used on the bike this year 2023.

Last year was washed out so we had to wait until this year to see the results of our hard work.

After fitting your exhaust and making some changes to carby and intake the bike gained 9 hp and almost 10 ftlb of torque

This year at speed week that resulted in a best run of 169.717 mph with a backup run of 167.8 giving us an average of 168 .8 mph. A provisional Australian record in its class

This would not have been achieved without your generosity and help.

My self (Pete) and Craig the owner and rider of the orange tiger bike would like to express our appreciation for your help.

We a so glad we can share these results with you.

The bike will be back here in Mackay end of May so I can look for some more performance to propel the bike even faster next year hopefully to the mid 170’s mph to maybe ?? grab a world record standing for the bike in its 2 litre push rod class

I have included a link to the you tube video of its run and a small video of some highlights of the event provided by cowboy hat films.

Also, some photos of the orange 2 litre 2003 anniversary wide glide we used to get these results.

As well some photos of the blue grey bike Ridden by Mark that campaigned with us in the 3-litre class that run a PB of 176mph , as you will see it uses one of your exhausts as well.

Once again thank you so much for assistance we are forever thankful.

 Regards Pete and Craig with the tiger bike"

POC Jason Stares


Customer calls..needs a 2" Pro Stock race pipe for large inch Shovel in a hurry. We build it same the next day to confirm finish and payment. Customer says he does not want it.

Life in the fast lane. Available for sale with finish of choice.


Robert Berry took a win with his Softail and one of our 00-1306 Pro Stock 2" Challenge exhausts. Hard work and prep pays off.

Born Every Minute As They Say: LSR 00-1306R Versus $2600.00 Stainless 2-1

You can spend upwards of $2600.00 for a, new to the market, stainless megaphone 2-1 exhaust with only two abbreviated heat shields and no long term history in terms of pipe mounts or over the road long term durability. No broken pipes or mounts.

For about the same money you can get a competition and dyno proven  LSR 2-1 00-1306R Pro Stock in dual coat black ceramic with full coverage heat shields, a TTS MasterTune, a TTS Camshaft and a RSR Dual Display AFR Gauge for, as-you-ride monitoring, to perfect your tune. Full 2" primaries, billet gaskets, and CNC machined turbo venturies.

We tried megaphones 30 years ago. They are a waste of time. It's old tech circa Norton Manx's and pukka 1950's English bikes. There are no megaphones on any race cars...formula,  GP, World Rallye, NASCAR...Nowhere. 45 years of this shit. We've seen it all.

Born every minute as they say.

On the other hand maybe we should raise prices to $2,600.00 since every minute there is a new one born....and sell you the other three items.

00-1306 FXLRST 2022

Customer writes: "Thanks for the awesome work the pipe sounds awesome." Kevin

00-1306 Before & After


Customer writes: "Hey. Attached are "before and after" pics;  fit was excellent, install went smoothly, and the tail section length was perfect!  Thanks for designing such a well engineered product!  She'll be climbin' on the dyno in the next couple months, will let you know the results!

00-1039 Envy

Customer writes: "Hello, wanted to share a pic of your Challenge pipe on my chopper...thanks for a great product...Jon

00-1306 B Style Softail

2020 Lowrider S: 00-1306R

Customer writes: "Hello you guys asked if I could send some  pictures once I got the exhaust on so here is a few of my 2020 Lowrider S  thanks again Dustin BSMC".

00-1306R with full heat shields in Dual-Coat Black Ceramic. Full race with sound attenuation. No silly megaphone.

Infinitely better than $1800.00 to $2300.00 stainless megaphone systems that have no heat shields and tend to crack if made in one piece.

00-1306 Fatboy Lo

Customer writes: "Just Installed on my 2012 Fatboy Lo! Thanks so much for everything. Sounds is amazing and performance is easily noticeable. Such a unique pipe which sets my bike apart from all the other Harley’s with the same old Vance & Hines exhaust. I’ve gotten more compliments on the exhaust than I can count and I just installed it this week! Cory."

00-1306RSD  2005 Big Dog

Customer writes: "Here is my 05 Big Dog Mastiff with your pro stock challenge on it. Love the performance! Night and day difference and the sound is amazing! Thanks again! Ray."

00-1306RSD with three heat shields. Over 20 years later still turning heads.

00-1306 Silver Ceramic

Customer writes: "Love the new pipes and they sound like a race car."

Finished It

Customer writes: " 1988 FXRS, 124 S&S, Baker 6 OD. Finished it. George."

Two 2-1

Customer writes: "Thank you so much for all you did to help put my 4th and 5th R B Racing headers on mt 2009 CVO Fat Bob and my 2015 CVO Street Glide. Yep I like yellow and the Pro one pipe on the Fat Bob brought the motor to life. But having the need for speed it is now going to go from a 110 to a 117 with direct driven cams. Thanks again. Steve"

S&S V111  Cone

The S&S machined cone does not taper immediately from the engine case as does the OEM item. We have had to make changes in our "B" style exhausts to clear this non-stock cone. It's always something.

Exhaust is the Last Item


The last item in your build is the exhaust...and guess what... There can be conflicts and it is now, you determine,  the exhaust's fault, not the other parts fault. The aftermarket ignition and wires on the left above are definitely not OEM.  Customer blamed the exhaust, not his aftermarket ignition wires. He said "Just move it down". It doesn't work that way. We said it takes another design due to the wires.

In this case we made a new exhaust in another FX Shovel fixture with a front pipe way further down (below) that would clear the ignition wires.

Of course as soon as we made the second pipe for the customer he cacelled the order...saying something about offending him. Go figure.

We run into non-oem parts like aftermarket highway pegs, non-standard forward controls, custom floorboards, and different master cylinders. Be clear what you have before you order. It is not the exhaust that is the problem.

Rigid Shovel... "Your exhaust is badass!!!!"

Customer writes: "I hear you guys like to get pics of bikes with your exhaust. So here ya go.... I'm building a 77 FLH right now and there's already a set sitting here waiting for this bike as well. Thanks Kevin:.


Long Term FXR Specialist Customer calls: "I'm building a new customer bike: Chopper Guys Frame FXR with a Twin Cam SE120R motor, carbureted, left side drive, motor offset for wider tire with aftermarket aluminum Swingarm...Want it quiet (sort of) and want it short"

No it is in finishing stages.

00-1306RS: Exhaust offset for frame / swingarm, mount for 6 speed transmission, 2" primaries, 15 degree merge collector, resonator, four full heat shields, single front 18mm O2 port for RSR Air Fuel Ratio Gauge. Headed for Dual Coat Black Ceramic coating. Long Range Motorcycles

Dyna 00-1306

Customer writes: "Hey guys I have been waiting to finish the mods on my Dyna before sending you pictures. This is how it looks now. This is a 2015 Dyna Street Bob. Your pipe is bas ass as expected and makes the whole look of the bike. The sound is great and when you get on it it is Loud As Hell! I am tearing down the engine next to make some horse power.
Thanks for a great product and great service! I enjoyed visiting with all of you on the phone.

Thanks again...Mitch".

Two Bikes

Customer writes: "Just wanted to send a pic of both my RB Racing Pro Pipes on my bikes. Put one on the FXR a couple years ago and liked it so much that when I got my FLHP, I got one for it too.

Can't say enough good about these pipes, they sound and look awesome. Anytime I can I will recommend RB Racing when someone asks about exhaust or to just browse y'alls website for all the info that can be found. Ronnie".


We are shipping out made to order exhausts for the new FXLRST ....probably the 13th model variation on the M8 Softail Chassis. Customers have been ordering LSR 2-1 Pro Stock 00-1306exhausts as well as our LSR 2-1 00-1418 Turn Outs and 00-1419 Slash Cut designs.

Evo FXRT style fairing and the gold colored wheels...Links to the past...A monoshock FXR, or would seem to be. Another M8 Softail packaging job.

Where's the Ape Hangers and the Captain America paint job? That will be #14.

00-1306R M8 Softail FXLRS

M8 LSR 2-1 Pro Srock 00-1306R. 15 degree merge collector. Three full coverage heat shields. Resonator 2.5" I.D. Secondary 2.5" (2.375" I.D.). Collector for max ground clearance.

Ultimate M8 Softail performance exhaust.

00-1306R M8 Touring

Ultimate M8 Performance Bagger Exhaust: LSR 2-1 Pro Stock 00-1306R in Silver Ceramic with three Silver Ceramic heat shields for maximum heat rejection for the rider. Wide open race system with some sound attenuation. If noise is an issue but you want a short system look to our LSR 2-1 Turn Out or Slash Cut.

00-1306 is LSR 2-1 Pro Stock 2-1, short, without the "R" Resonator.

Big Engine M8: 2" primaries,  four O2 ports, a 2.5" secondary (2.375" I.D.) and a Silver Ceramic 3.5" O.D. Stainless Steel resonator (2.5" I.D.) for decibel reduction. Collector for maximum ground clearance.

We've been making 00-1306 LSR 2-1 Pro Stock Pipes with full 1 3/4" and full 2" primaries for Baggers way before anyone got the bright idea of racing these couches.

The bike above completed a 2200 mile run and the pipe looked exactly the same as when it was installed

Baggers Get Air...Way, Way before King of the Baggers

Danny Arnold, Doc's Harley Davidson writes: " Thank you guys for the Challenge Pipe for my Bagger. It works! Better HP and TQ numbers than ever before. I was able to trim time off my ET and had better MPH. My bike is an 02 FLTRI with a 107". It's my daily rider and is the #1 plate holder with the AMRA in the D Class and is also the record holder all the way across the board thanks to you! Thanks again."

We have been building Bagger Race exhausts for way over 20 years...Shovels, Evos, Twin Cams, and M8's. 15 Degree Merge Collectors...with or without a Resonator.

125 MPH Quarter Mile...Shovel with Bags

LSR 2-1 Pro Stock Shovelhead 00-1382, 2" C Style....and you thought your Twin Cam was fast.

00-1306R Big Inch FXR

Ultimate FXR Pro Stock Pipe headed for a 124" FXR.

00-1306R: Chrome LSR 2-1 Pro Stock with 2" primaries,  a 2.5" secondary (2.375" I.D.) and a polished 4" O.D. Stainless Steel resonator (2.5" I.D.) for decibel reduction.

The ultimate FXR exhaust. A wide open race pipe for the street with Db reduction.  Also available with 1 3/4" primaries for smaller motors like 80" or even un-modified S&S V111 square motors.

00-1306 M8

Customer writes: "Hi,

Finally got a photo of the bike with the exhaust on. To say I'm happy with how it sounds and looks would be a huge understatement!! I absolutely love how deep it sounds and that noise when I open it up is just so damn good!! It even impressed the guys at my local Harley Davidson dealership so that is saying something.

Thank you for an amazing product! Jamie."

00-1306... 2013 Dyna

Customer writes: "To the lady who answers the phone. Here are some pictures of my 2013 Dyna with your amazing exhaust. 107” motor 125 hp / 127 tq. It sounds amazing and turns heads everywhere I go. Thanks for an amazing experience! Mark."

00-1095...20 Miles Later

Customer writes: "Thanks guys. Pipes arrived sooner than expected. And they are fantastic! Only have about 20 miles on them but can already tell the difference.

Have never had such a performance improvement on a exhaust change.

Thanks again PHD".

MasterTune BT Diagnostic and Development Tools
Communication Interfaces

The MasterTune BT Communications Interface is the tool that provides 2-way communication between the bike's ECM and a Windows-based laptop/PC utilizing the MasterTune BT software. The interface also provides stand-alone data logging for diagnostic and calibration support. The MasterTune BT software package can be downloaded for free at

Part Number 

MasterTune BT Communications Interface - CAN 6 Pin (2012-2020) (Gray) 

When used for calibration development, this interface marries to the ECM during the first ECM flash and further calibration development can only be performed on that ECM.
When used for vehicle diagnostics and data logging, this interface can be used on any compatible vehicle, even if already married to an ECM.

MasterTune BT Interface communicates to the PC via a wireless Bluetooth connection. Also includes a support loop to attach the interface to the bike via a wire tie.

Compatible with the following Delphi equipped Harley-Davidson Motorcycles:
    •    Touring models 2014-2020
    •    Softail models 2011-2020
    •    XL Sportster models 2014-2020
    •    Street models 2015-2020
    •    Dyna models 2012-2017
Works with the following MasterTune software products:
    •    MasterTune BT
    •    DataMaster BT
    •    VTune BT
    •    Flight Recorder


Part Number  2000021


MasterTune BT Communications Interface - CAN 6 Pin (2021+) (Red)
When used for calibration development, this interface marries to the ECM during the first ECM flash and further calibration development can only be performed on that ECM.
When used for vehicle diagnostics and data logging, this interface can be used on any compatible vehicle, even if already married to an ECM.
MasterTune BT Interface communicates to the PC via a wireless Bluetooth connection. Also includes a support loop to attach the interface to the bike via a wire tie.
Compatible with the following Harley-Davidson Motorcycles:
    •    Touring models 2021-present
    •    Softail models 2021-present
    •    RevMax models 2021-present
    •    (Sportster & PanAm)
Works with the following MasterTune software products:
    •    MasterTune BT
    •    DataMaster BT
    •    VTune BT
    •    Flight Recorder

In the late 70's, all through the 1980's and into the mid 1990's we used to spend about 5 months out of every year tuning things. No time for that anymore. It's best that you tune your own bike...add up the hours and write yourself a hot check. Or just pay somebody. We use a Supeflow CycleDyn Dyno and we ride in the real world using our RSR Air Fuel Ratio Gauges.

When you order the TTS MasterTune, a LSR 2-1, and our RSR Air Fuel Ratio gauge,  and a TTS Camshaft (see below) there is a $100.00 discount. Real world.

M-8 and Twin Cam TTS Camshafts


TTS M8 Camshaft left above. Mercedes / Illmore pushrod V8 Indy winning 265E camshaft to the right. Pay attention to the lobe design.

Ilmore found that with a pushrod design there was so much monkey motion going on between the camshaft lobe and the actual valve opening that it made more power and torque to gently (preload if you will) open and close the valve. Slamming the valve open introduced disastrous harmonics and accelerated valvetrain wear.

Steve Cole designed his TTS 100/150/175/200 camshafts plotting the acceleration rates contrary to what others did i.e. banging the valve open and shut. Years later Steve finds others are copying his designs even if they do not know why he designed them that way. Camshaft descriptions.

If you actually ride instead of parking and talking about your dyno session you will find the TTS cams will outperform all others in the vital roll-ons in the 1000 to 4000 RPM range.

TTS M8 cams are priced at $275.00. $358.00 for Twin Cams. In stock at RB Racing to pair up with our LSR exhausts and our RSR Air Fuel Ratio meters.

00-1306 Aloha

Customer writes: "Aloha! Here are some shots of your pipe. Thanks for a great product!! Mahalo, Guy.

Pre 2004 EVO Sportster 00-1224

Sportster 00-1306

Customer writes: "Hey, I called the other day and had some questions of making a 04+ exhaust fit a 86-03. After a rear exhaust bracket was made, it fit perfect, I included a photo. I love the exhaust. Thanks for the info!!!! Mike L ".

Custom Build...2 Years Later

Customer writes: "Two year finished project capped off with your Pro Stock Pipe. Thanks, makes my toy complete! Michael"

Cruise Control, Closed Loop Delphi ECM, Twin Cam "FXR". XL1200 suspension.

2017 CVO Breakout 124CID: 147.14Hp @5960; 161.23 Torque @ 3760

Customer writes: "My bike is a Pro Street 2017 CVO Breakout. The Dyno chart is after I put 680 Star Racing cams and it is comparing the 640 cams . 680 has more torque down low.

Thanks I love the pipe ...Robert"

00-1174 LSR 2-1 Pro Stock 2" primaries in Dual Coat Black Ceramic.

2001 XL Frankentrike 00-1306

Customer calls us asking for us to build a a 00-1306 exhaust for his built 1275 Sporster that his engine builder says won't do shit with the usual "Short Shot" Duals that all the Trikes run.  He suggests that the customer call RB Racing.

The owner has three HD trike conversions due to a nerve communication issue.. One of which belonged to his late wife.

This is the 00-1306 1 3/4" Challenge we built for his 2001 XL 1275 with a Frankentrike conversion. Headed for final polishing and chroming. Should put out way past 100HP. His engine builder suggested they install wheelie bars. Good idea.

We shipped it...the guy probably passed away like his wife as we lost all contact. Hope he ran it.

Shovel 2" Pro Stock

Customer writes: "Lynn, here a couple of pics of the 73 finished, exhaust are not as loud as I thought they would be, but looks and sounds great. Carl".

00-1381 in Silver Ceramic. Looks like it just rolled off the showroom.

00-1306: 142.5 Hp  151.17 Torque

00-1039 Big Inch Springer

00-1306 2"

Customer writes: "Hey Lynn, just off the lift - love the look and sound.  Will send a good pic when I get 'er out.  Another rain event headed this way! Thanks, your web site is the best!

00-1306with three heat shields.

127 Ultima FXR

Customer writes: "To everyone at RB racing.

After I had got the prostock pipe for my FXR  installed and went for a ride I immediately compelled to thank you for all the time and hard work you guys obviously put into your products. The quality is superior and the sound that comes outta this 127ci Ultima evo gives me freakin chills. This engine is very finicky when it comes to exhaust and Ive been through quite a few pipes on this build, the Pro Stock has finally made her happy.

I'm more than happy with this exhaust, definitely well worth the price. Thank you Lynn for keeping me notified of the shipment. The neighbors can kiss my ass if they can't appreciate what a wonderful sound it produces. Keep up the fantastic work and have a great day. Chris S. 93 fxlr".

00-1306R 2005 Sportster 2"

Customer claims his build was going to get him 165HP...We had sent him a 1 3/4" Turn Out which he chose to not use... So we made him a 2" LSR 2-1 Pro Stock Challenge Resonator exhaust...Certainly capable of having 180+ hp throughput...As for the 165HP we shall see. Silver Ceramic with a chrome collector heat shield...something mentioned about a passenger's leg needing a shield

00-1306R FXR

Customer exhaust headed for a big inch FXR.

00-1306R Resonator exhaust, the most sophisticated "Pure Race" pipe you can run on the street. Dual Coat Black Ceramic with resonator in brushed stainless colored after three trips through a 600F oven. The Resonator dampens the sound with and I.D. larger that the secondary post merge collector tube. Zero restriction.

Warfighter Made

PDF Explains:

No money exchanged hands.

00-1306R Dyna

Customer writes: "Hi. Super nice deep sound and super look. I really like it. Teamed up with the RB Air Fuel Gauge its just a great setup for this engine and the Mik48.

Thank you RB Team."

00-1306R LSR 2-1 Pro Stock Challenge (Resonator)...Silver Ceramic, 3 Chrome heat shileds, Brushed Stainless Resonator. Pure race system with zero restriction Db reduction resonator.

Note: The Resonator is just that...Not a baffle. The I.D. of the resonator is larger that the I.D. of the secondary pipe after the collector. Zero restriction just Db reduction.

Short Shots v. LSR 2-1 Pro Stock Challenge 00-1306

Customer writes: "Thank you for the pipe. The bike was a 124 S&S with V&H Short Shots. Gained 35.28 hp and 25.12 torque.  He was happy. Thanks again. Bryan"

Bryans Customs, Boise Idaho.

Shovel C Style 00-1306 2" Challenge

Headed for final polishing and chroming for a big-inch FX Shovel. Front primary slips into the 2" merge collector. 18mm O2 port on front cylinder for the RSR Air Fuel Ratio Gauge.

B Style Shovel Challenge Pro Stock...Proud and Loud

Customer writes: "Here are your new hand made pipes on my old bike they look great an even sound better than my old hand made pipes. People can't believe the difference they make.
I was going over to some friends house on the back roads they didn't know I was going over but they heard me long before I got there  an were standing outside to see who the hell it was coming up the road. They were talking before I got there trying to guess who it was and one of them said "I don't know who but that's a real fucking Harley coming" oh  an they were right it's a real fucking Harley...  In the looks and now the fucking sounds too.

So if you want to stand out in the pack get your fucking order in today  If you want to be the same as everyone else then go buy the bull shit off the shelf then an fit in the square group then and don't stand out because you are a chicken shit then we only need people you got the BALLS  to stand out an be loud and proud  then if I pissed some one off because they don't have these bad ass pipes then too fucking bad.  I got mine an I am fucking loud an proud.  My name is Caveman an I'll tell everyone how damn good your pipes are.. Oh yeah, have a nice day an be proud an loud."

Out of the hospital with a new valve job

To the BOSS MAN ....
Hey Brother I’m writing to you today on the day of my discharge from the hospital ..
After having Open heart surgery with five bypass being done...
Being in the hospital is never any fun ... But it was something that had to be done ...
While I was working on my recovery and being Fucking bored ....
I got on this computer shit ...just checking shit out ...
And I thought about looking your site back up...Because I had y’all make me ...
A WONDERFUL EXHAUST for my Yellow Shovel Head ....

And I had noticed there was a thing saying not to buy your WONDERFUL EXHAUST.....
And I was like. Mmmmmmmm... what is this shit about...
So I tap on it and was reading ( yeah I can read ) ...
Well it seems that some puss...was upset about his pipes... not fitting just like he had hope for he’s being a little Bitch about it ...
And I was like what the Fuck man ... He claims that he send them back ...
And you had sent him a picture ....of them showing that they did fit on a bike like his ..
And I noticed that he had add that was a stock bike .... and I was like Dam what a Dumbass...if you had custom shit done to your ride ...why HELL didn’t you send these
Wonderful people some pictures of that ...or even better load that crap bike into the back of a truck and take it out there to them so they could see first hand themselves....
But no instead he wants to be a little puss ...and Bitch ( it was my guess it was your comment about knowing how to use tools ) that really pissed him off...

Well Brother I’m as happy as a hard cock in a nice warm puss about my ...
And having to deal with a ASS HOLE is just part of the job you well know yourself...
And I tell everyone that I meet and ask about my WONDERFUL EXHAUST about y’all...
And y’all do people right..
So I figured that if he wants to try and bad mouth y’all..
I’m standing in y’all corner... I know that your not worried about that little puss ...
But to me it just didn’t seem to be fair ...what he was trying to do ...
And I wanted y’all to know...that y’all got one hell of a satisfied customer here ...
I figured if he could bitch.... then I could Dam sure show some fucking praise for y’all..

I had to write because y’all needed to know that there is much love out here for your
Wonderful work ...and the wonderful people you have working for y’all....
Thanks for hearing me out Boss man ...
Sent from my iPad

Branko Built

Brankobuilt  Shovel from Down Under. Two Inch Pro Stock 00-1381 in chrome. Built big inch to go and stop... Bye bye OEM banana rear brake and crappy front brake. Practical, reliable, sled that will outrun your CVO. Clean bike.

Full-On restorations and new parts from Brankobuilt...all years. Check out their Knucklehead restorations.

M8 Softail

Customer writes: "I finally got your race pipe on my bike and it sounds awesome , i had my mechanic put a zippers tuner in with woods cam and it sounds like a Chevy motor with open headers . Couldn't be happier with the results of this combination , loads of power , no dyno numbers i can just feel the difference , keep up the great work ! Lew".

00-1306  LSR 2-1 M8 2" Pro Stock Challenge.

Aceautoparts 1st Place...Ted

Last race of the season Temple TX Harley Parts Drags. 1st place. 2" Sportster LSR 2-1 Pro Stock Challenge. Racer.

Softail 00-1306

Customer writes: "Hello.I hope all is well in your part of the world, first up thank you for sorting out bits n bobs to fit the second hand Pro Stock Pipe I purchased of a 2007 softail which arrived well packed and fast.

The pipe fit like a glove, provides access to my clutch cable and shows off my Carlini torque arm nicely. I only got it on the bike an hour ago and took it for a quick blast..... when I got off the bike I was dumbfounded, I knew there would be gains but I wasn’t ready for this! Throttle response improved, hp gained as an estimate 10/15 hp with an exhaust note that’s all business with no back cackling bullshit! All this with no tuning to suit the pipe! The best exhaust system on the planet, not trying to blow wind up your arse just calling it for what it is! This system is the first bolt on horse power everyone should purchase, the V&H big shots I removed were 6 pounds heavier! It’s like winning the horsepower lottery finding your system!

Now I have the exhaust sorted (with 18mm sensor ports bunged off) I would like to fit your AFR meter for obvious reasons, you recommend the single display for carby models. Down the track I will invest in your closed loop fuel injection system for my EVO, so the question is... could you please advise the correct set up for my 1999 FXSTC with this in mind, perhaps the dual display for future improvement? I have dual CHT gauges and my bike runs front 280 and rear 270 which is at odds with the norm, btw screamin eagle 1550 kit was fitted prior to buying the least that’s the info given and I haven’t put it on a dyno to suss it further as I hate to burn money.

In closing, thank you for an awesome exhaust system which I had no idea would be this good and I can’t get the grin off my face, and thank you in advance for any advice you can give on the AFR meter.

All the best and kind regards, Peter (the bloke in Melbourne Australia with the huge grin on his face compliments of RB Racing LSR Pro Stock Pipe)."

Seeing Double

Customer writes: "Got my prostock on my CVO springer, looks great, sounds better, super bad pipe, thanks for getting it done fast. Got 2 now, the badboy still looking and running great also. Thanks again, Chris."

New 00-1306R Exhausts (Resonator Db Reduction)

These new LSR 2-1 Pro Stock Challenge 00-1306R  designs are available for our full product range i.e. Evo Sportsters (all years) including S&S SA cases, with offset cam chest,   EVO Big Twins and Twin Cams to include S&S SA B1 / B2 / B3 cylinder heads...And all the new Milwaukee 8 Dressers and Softails Models.

Finish Options 00-1306R Exhausts

Pictured above is our LSR 2-1 Pro Stock 00-1306R for a Twin Cam Dresser. Customers are making 180 or more horsepower and 200+ ft/lbs of torque with our LSR 2-1 Pro Stock systems...Which are wide open with no baffle.

We offer the new  "R" version with a 4" diameter, welded-on,
resonator tail section that has a straight 2.5" through by-pass.  This will knock some decibels off so you can be sort of socially acceptable.

Note: All "00-1306 Pro Stock Challenge" models do not have any baffle as inserting anything into the 2.5" tail section will hurt performance. The 00-1306R model should be ordered for a noise Db reduction with no hindrance in performance.

The resonator section can be in stainless as pictured above or in the Ceramic Silver or Dual Coat Ceramic Black....In picture above the straw-colored stainless Resonator is as it comes out of the 600F oven for the third time during the Dual Coat Black Ceramic process.

If the exhaust is ordered in chrome then the resonator is TIG welded on with 308 Stainless rod after the exhaust is chromed. In this case, the resonator can come in a brushed finish or polished finish. The above part is for a mid-peg 2005 Dyna with a 124" motor. It ships with three chrome heat shields.

The above 00-1306R part is for a M8 Softail with a polished resonator. Polishing is an extra cost.

All 00-1306R systems are available in ceramic or chrome finishes. The three optional heat shields (f / r / collector) can be in chrome, silver ceramic or in black ceramic.

Note: The Resonator is just that...Not a baffle. The I.D. of the resonator is larger that the I.D. of the secondary pipe after the collector. Zero restriction just Db reduction.

Pictured above is a 00-1306R for a 2020 Low Rider S Softail in full Dual Coat Ceramic Black

All 00-1306R systems are only available in ceramic and not in chrome finishes. The three optional heat shields (f / r / collector) can be in chrome,  or in black ceramic.

Pictured above is a 00-1306R in Siver Ceramic with Brushed Stainless Resonator. Early Twin Cam Dyna (pre 2006).

Note: The Resonator is just that...Not a baffle. The I.D. of the resonator is larger that the I.D. of the secondary pipe after the collector. Zero restriction just Db reduction.

2020 M8 Softail Low Rider S  00-1306R

Customer writes: "I was very surprised by the sound level of the pipe. I have owned a LSR 2-1 00-1306 (no resonator) on a prepped Twin-Cam 110ci, and I must say this new pipe is incredibly quiet even though I run it on a 128cid with 11:1 compression. Dare I say « too quiet ? » ;-)

As I am used to LAF pipes, I was almost disappointed when firing the engine. But after a few miles running the bike I must say the sound level is just great.
Tone is very deep, and it will bark but won’t kill your drums when you open wide.

By the way, my neighbors thank you…

Performance-wise, the pipe seems really excellent, but I guess you need no feedback on this point !

I was aiming with this build 150-155HP. Engine is already shooting 170HP with a partial tune. Midrange torque is unbelievable.
Ill be back with more precise figures as the bike gets fully tuned.

Update: And thanks for the new shield. Fitment is perfect.

128ci, 173Hp@5300, 194Ft.Lb@4300 (Engine figures), 30 tooth Belt Pulley.

Hang on! That ride is a blast !!!

Best Nicolas"

LSR 2-1:  Dual O2 Sensor Ports 12mm and 18mm

All Milwaukee 8 RB Racing LSR 2-1 exhausts have both 12mm and 18mm O2 ports. We recommend you stay with the 12mm O2 control and use TTS MasterTune. Some Dyno shops will retain the 12mm O2 sensors but want a wideband port to assist in tuning. Some people drink the purple Kool-Aid and run only wideband sensors. Whatever you want to do.

For 12mm O2 applications we recommend using TTS MasterTune and buying our RSR Dual Air Fuel Ratio Gauge (Two 18mm Sensors) to monitor your bike as you ride where you can observe transitions , cruising, and wide open throttle air fuel ratios visually. Instant information in the real world. Better than the dyno as you ride in the real world not overheating the engine on the dyno.

Customer writes: "Sounds like a FAST Harley!  Revs quicker.  Everyone that knows the bike immediately notices how the engine has better throttle response now.  One blip of the throttle is all it takes to spark envy.   It has a noticeable volume and powerful sound on acceleration complimented by a smooth deceleration growl.  Cruising volume is somehow arguably quieter than the V&H slip-ons that were on the bike previously.  The chrome is flawless.  Packaging was excellent.  It’s amazing how spot-on the fitment of the slip joints are. 

The mounting bracket is perfect in form, fit and function.  Everything eases into place with a slow methodical hand.  Don’t force or rush the installation and you will complete it without frustration.  I bought the Dual AFR meter at the same time as the pipe.  I cannot imagine an easier way to tune with my TTS MasterTune!  I was able to actually improve the tune and power while maintaining 43 mpg. Thanks! Ryan"

00-1306 M-8 Nitro Pro Stock Challenge and M8 00-1306R Nitro

We also can make a 00-1306 Pro Stock Challenge LSR 2-1 "Nitro" exhaust with a "Kick"  to keep the exhaust at 45 degrees rotation. All the new M-8 models have better cornering clearance anyway. The standard 00-1306 also clears the bags with plenty of space.

No baffle. Full race. Available with 12mm and, if specified, two additional 18mm oxygen sensor bosses (no charge). Standard is two 12mm bosses for the OEM 12mm sensors.

15 Degree Merge collector. Two inch primaries. Billet flanges and clips, billet gaskets and three heat shields. This exhaust is going full Dual Coat Black Ceramic, both exhaust and shields which is the most popular choice.

S&S T143 with B3 Heads

143 Cubic Inches for your Dresser. Another way to spend $10,000.00 to $15,000.00 to climb the Horsepower mountain. We are making exhausts for these with out integral two bolt B3 flanges. The exhaust port dimensions are not OEM Harley. There are slight variations between the B1/B2 and B3 S&S heads.

We have made custom parts for these two bolt T143 B3 cylinder heads. Available for the four product ranges we manufacture...Quiet (LSR 2-1 Black Hole) to Full Race (LSR 2-1 Pro Stock). All use 2" primary tubes.

The new two bolt LSR 2-1 B3 Flange is integral, free rotating, to the exhaust port. Full tapered cnc machined venturi for 2" primary tubes. 1.875"ID.

Uses a machined 1.875" I.D. Billet Aluminum Gasket.

Belts won't last on these 143T motors so we offer chain drive/swingarm conversions for 09 and later Baggers. Used by S&S on their T143 test bike.

S&S SA B1/2/3 Heads

We have been asked by customers to provide LSR 2-1 exhaust systems for B1 / B2 / B3 heads originally found on EVO and 145" S&S Tribute engines and later T143 engines. Early B1/B2 four bolt flanges. Later B3 use two bolt flanges.We make both. The diagonal dimensions are the same two to four bolt patterns.

We have LSR 2-1, LSR 2-1 Pro Stock, LSR 2-1Pro Stock Spyder and LSR 2-1 Black Hole designs for these three S&S cylinder head variations.. Pictured above are our laser cut flanges and cnc machined hour glass shaped venturis that we heliarc to the B1 / B2 / B3 LSR 2-1 exhaust systems.

We have a specific fixture for the 126 S&S and T143 SAB2 / SAb3 Twin Cam Dresser systems as the billet cam cover is not OEM.

We also have a special fixture for the 145" S&S Tribute Engines.

2" LSR 2-1 Pro Stock Challenge 00-1306: Milwaukee 8 Softail (not for mid-peg models)

00-1306S Prototype

The 00-1306Sis the stainless version of our LSR 2-1 Pro Stock Challenge. We prototyped out this one in thick 16 gauge tubing to see what was involved beside the additional expense. This was for a M8 Softail for a Bonneville customer who was searching for 200hp...a bike that was not completed...big dreams, no execution.

We pre-chromed some of the hardware like our cnc machined venturis and the pipe rear mounting bracket.

00-1306RS Prototype

A 00-1306RS version with the resonator for decibel reduction. Same 2" primaries and 15 degree merge collector as other versions. Prototype.

Note: The Resonator is just that...Not a baffle. The I.D. of the resonator is larger that the I.D. of the secondary pipe after the collector. Zero restriction just Db reduction.

Above is a 2020 M8 exhaust which is OEM stainless after less than a few months of use.

The issue with stainless is that it will turn gold, then brown, then black-ish...Plus you cannot chrome it. Then there is the issue of the heat shields if also done in stainless.

Stainless is also soft compared to heavy 16 gauge mild steel and is usually made out of thin-wall tubing....0.049" or less...or as we say "Oh too Thin Gauge"...typically 20 gauge .035". It has to be 16 gauge 0.0625".

00-1306 Pro Stock Challenge...White Hot Flames

Customer writes: "The addition of the LSR to this built 110” twin cam made the bike have much more torque and throttle response !! It sounds incredible kinda like a top fuel at idle. I love it !! The guy on the ditch side not so much!! Colin."

Customer writes: " Love our RB Racing LSR 2 into1's"  Jonathan.

FXR CVO3: 00-1040 LSR 2-1 Pro Stock Silver Ceramic

Customer writes: "I just did a shakedown run after installing your Pro Stock pipe on my FXR. It really seems the bike runs smoother at high speed, and it sounds awesome. I can only describe the sound as “angry”. The look is fantastic, and I appreciate the custom heat shields. I will definitely be recommending RB Racing exhaust to everyone. Thanks again!! Ronnie."

Bad Boy Spokes!!!

Customer writes: "The pic I promised of my new Pro Stock on my Bad Boy. Looks, performs and sounds badass. Compliments on it everywhere I go. Thanks for everything, and just thought I'd include my buddy's cvo springer, he got the Challenge.

00-1386 FXRP

Customer writes: "I just wanted to take a minute to send a picture and say Thanks ! It was great getting to come into the shop on my trip to California. The quality of the pipe is awesome and the packing was so good. I’ll be in touch and send some better pictures. Ariel."


Customer writes: "Damn I wish I would have bought these years ago.They sound good as a MF!!! the whole bike seems to ride better. I had to relocate mount to tranny. They look better than my others I sent pic of old pipes pls don't laugh. Thanks Lynn for all your help!!"

2nd Life

Customer writes: "I bought a Pro Stock exhaust for my 2000 Ultra Classic a couple years ago.  I sold the bike in February, 2019, and the man who bought it wanted the stock pipes back on it. I took the Pro Stock exhaust off. 

I turned around the next week and bought a 2002 Heritage Springer.  It had a D and D exhaust on it that I didn't like.  I called RB Racing and you said the Pro Stock would fit the engine, but may have to modify the bracket.  It went on easy and I was able to mount it using the Ultra Classic bracket that it originally had.  No drilling or cutting.  Only had to use one mounting bolt on back of exhaust to bracket. 

The Pro Stock looks great and sounds better on the Springer. Thank you for all you help.  2002 Springer, 95ci, Mikuni carburetor, Andrews 26a cam. 18 inch LA Chopper Apes. Rick".

LSR 2-1 Pro Stock in Dual Coat Black Ceramic.

B Style 00-1306 Forward Controls Late Dyna 124" Video

LSR 2-1 Pro Stock Challenge exhausts use the same part number, 00-1306, no matter whether they are for Shovelheads, EVO's, Twin Cams , or M-8's.

The rear pipe configuration depends on the specific model and year. For example, all Dresser 00-1306 designs are "C" meaning the rear pipe turns before the "cone".

Late model Mid-Peg Dynas (2006 and later) use the "C" style. 2006 and later Dynas with forward controls, pictured above, can use either the "B" or "C" style designs.

All Sportsters are "B" Style i.e. the rear pipe wraps around the cone.  FXR's can be "B" or "C" style.

All M-8s are "C" style.

Two Goblin FXR's

Customer writes: "As requested here are a few pics of the 1985 FXR drag bike w/ 124” S&S engine and B-style RB Racing Pipe and a pic of the 1988 FXR street bike  with 103” with RB Racing pipe in the foreground and drag bike in the background.  I would be honored to see my bikes on your page. Thanks Joe. "

Rev Limit Removed


Customer writes: "Just a bit of kudos to you. I purchased a pipe from you and just wanted to let you know what I thought. I will ALWAYS be function over from. Put the pipe on and proceeded to destroy a set of lifters. "I do place the blame for this squarely on your product." It was a night and day difference.

Revving so quickly it was incredibly hard to catch it, before it banged the Rev limiter. It really took me a minute to comprehend what was going on. I had burped the limiter before, but in the situation described it actually shut off momentarily. Your pipe has actually changed the math I use. Updated the valve train and went just a bit more aggressive with the cam. I can't wait for this season.

Thank you for a fine product. Jody D. Above the Means Racing

PS. Really nice chrome!"

Eat Ass

Customer writes: "RB Racing..Here is the bike I built..runs 10.30s at 126mph..I have dirt tires on it right now...drags racing on dirt..recipe for disaster..Ted"

00-1306 LSR 2-1 Pro Stock Challenge in Dual Coat Black Ceramic

Pure Race Systems! No Baffles! No 1950's megaphones, No Aluminum Butt Plugs.

Sophisticated 15 Degree Merge Collector Maximizes Power


We handmake our 1 3/4" and 2.0" Merge Collectors to maximize the potential of our LSR 2-1 Pro Stock Exhaust Systems. You must have a shallow angle merge to maintain a high velicity (lower pressure) with less disturbance flowing into the constant diameter tail section. When do you go to 2.0"? Well, the general rule is, when the motor goes over 100 cubic inches and it has cams and other work you go to 2.0".

Exceptions to this would be, say for a stock 103 Twin Cam, you should stay with a 1 3/4" system. In the case of the new 4 valve Milwaukee 8 motors we go directly to 2.0". If you have a built 95" motor you can go to 2.0". For a given engine size with a mild to stock engine the 1 3/4" will produce power about 300 RPM sooner.

It all depends on your motor size, intended operation, and what modifications are done. Bigger is not always better.

Milwaukee 8

2017 to Present: People kept asking about RB Racing releasing LSR 2-1 exhaust systems for the new Harley Motor. Well, we are fixtured for all of them with a new muffler design that takes into account the increased compression and displacement.

Testing has shown cam changes need to be made along with a 2-1 exhaust to make any appreciable gains. Go ahead buy your $500.00 air cleaners and your $700.00 Monster Slip-Ons...keep the economy going.

It's still an air-cooled 45 degree V-Twin no matter what they say about water or oil cooling. BTUs are BTUs...It just has less flexibility in terms of modification than EVOs or Twin Cams at this time.  Another expensive puzzle. Not yet.

People tend to forget these are heavy couches. Adding weight is a no no. One of our M-8 test bikes came in with a V&H M8 Duals that, when we removed them, weighed 41 pounds!! Our M-8 exhaust weight far less than Half of that and the Pro Stocks 1/3 of that. Power to weight ratio. Heavy couches.

The Milwaukee-8 is a taller, heavier engine with the O2 sensors moved upstream, closer to where they should have been. Earlier LSR 2-1 designs will not fit this motor. We supply a different saddlebag mount system for our under the bag designs like the Pro Stock Spyder and Black Hole. All systems also have a three point laser-cut mount off of the transmission.

00-1306 LSR 2-1 Pro Stock Challenge exhaust with 2" primaries. Prototyped at RB Racing on 2018 Softail FLSB Sport Glide.

We maintain these 00-1306 in stock (popular item) in Dual Coat Ceramic Black with Ceramic Black Heat discoloration and the greatest heat rejection.

There are two versions: One for mid pegs (FXLRS; FXBB; FXLR)...and a second for forward control models (FLSL, FXFB/S , FLDE, FLSB, FLFB, FLHC/S, FXBR/S, FXDR)

00-1306 Challenge 128CID: 180HP; 204 FT/LBS Torque

Customer writes: "Here's a photo of the bike... I'm very happy with the pipes and performance. Recently had the128 kit installed. Regards, Jason".

00-1306 2" Pro Stock Challenge for the new M-8 Softail. Finished in dual coat ceramic black with three heat shields.

00-1408 2" Milwaukee 8 Pro Stock...J.J.'s "Beast"

Currently in the 135 hp range...Now being bumped from a 117" to a 127"....Assembled by Cool Springs Harley Davidson. Tuned with a TTS MasterTune.

LSR 2-1 Pro Stock Part Number 00-1408 in Dual Ceramic Black. 2" primaries with heat shields.

Real World Tuning Package

When you order a complete LSR 2-1 exhaust with the RSR Air Fuel Ratio Gauge and The TTS MasterTune there is a $75.00 discount on the total price. You can observe while you ride in the real world to evaluate transitionals and wide open throttle . In actual dyno tuning you really have to hold one "site" i.e. the intersect of load and rpm to get an accurate feedback. That's why you see Superflow engine dynos doing step testing.

The problem is things heat up in these air cooled engines and the hidden code in the Delphi ecm starts changing things. You can really only do one wide-open throtte pull and one rpm site before the engine heats up too much. Best do real world data recording with the TTS while you ride and then evauate, in real time, your map with the RSR  mili-second fast RSR Fuel Ratio Gauge. Real time monitoring when you ride is the only way you can evaluate transitionals, acceleration additives, and wide open throttle...all in the real world air and on the road like you do normally.

Milwaukee 8 Exhausts: 12mm and 18mm O2 Sensor Ports Standard

All LSR 2-1 Milwaukee 8 Exhausts come standard with both 12mm and 18mm O2 ports. This gives customers the choice to run either the OEM 12mm or 18mm O2 ports (or both with our RSR Air Dual Fuel Ratio Gauges).

RSR Dual Air Fuel Ratio Gauge.

Milwaukee-8 LSR 2-1's in production..Dressers and Softails

Above: Milwaukee-8 exhaust LSR 2-1, 00-1306 Pro Stock Challenge for a 2017 Dreser in 2".  Note that the rear pipe and the front primary tube have slip joints for the Dresser rubber-mounted engines. Coated in Dual-Coat Black Ceramic for a customer who wanted a "Really loud racing exhaust".

At the dealer level cnc ported heads, cams and bigger bore kits are up to about 130-135 hp. When you consider an 80" EVO was about 58 HP with 175 to 200F oil temperatures it's no wonder these run closing in on 300F hot.

00-1306 Big Motor

Customer writes: "Hello,
I received and installed the pipe last week and I am very satisfied with my purchase. I was running some shorty duals that exited right at my ankle and were making my right ear ring every time I rode it plus they robbed my low end a little. It now sounds much better and performs just as good as it sounds. I noticed an increase in torque and it seems to run smoother and better in all rpm ranges which is likely the result of better scavenging. I think the bike looks better now too.

The chrome on the pipe is excellent and the fit is great for a pipe that is not right off the shelf. Because the cylinders are .250 taller than stock the pipe didn't exactly meet the rear mount but was able to use the one that came in the box plus one I had from another bike. I am now considering a 2-1 for my bagger so I'll keep you in mind. Thanks for a superior product. I have included a pic of my bike with the PSC pipe installed." 

00-1306 2" Pro Stock Challenge with offset for wide tire. Three chrome heat shields.

00-1306 Power Gains

Customer writes: "Hi Rob and RB racing team. I have attached a photo of my new prostock rsd challenge pipe on my bike along with the dyno sheet, which shows both my old pipe and new pipe dyno numbers. The proof is in the pipe. The motor is a bone stock Ultima 127. The pipe gave me 11 more hp and 15 ft lbs!

 Sorry the bike photo isn't the best, but the pipe still looks awesome and sounds unreal.

Top notch product and customer service I couldn't be happier. Thank you,  Ryan."

 00-1329 LSR 2-1 Pro Stock 103" Dyna


 00-1050 Pro Stock in Silver Ceramic

Customer writes: "I bought my exhaust about a year ago, and after it arrived I couldn't wait to hear it. Well here we are 18 months since I started the build and I must say it was worth the wait! Looks and sounds awesome! ".

RSD 00-1306 Challenge

Customer writes: "Thanks so much for this exhaust system. This pipe is flawless and sounds awesome. If you would like any more pics I can send them to you.Thanks, Brian".

Semper Fi Times Three

Customer writes: "2000 FLHTCUI  bought new 18 years ago.  I put a SE 95" Big Bore kit on it after 6 months and a nice set of Samson slip-on's.  I decided the old pipes had to go, so I bought my third set of LSR 2-1 Pro Stock Pipes.  That says it all, I really like these pipes.  I'm not a racer, my bikes aren't highly modified,  I like the looks of the pipes, the sound is second to none, and they are easy to install.  Here is a picture of the Ultra with the new pro stock. 

Also, I've added pictures of the three bikes together together.  2008 FXDWG, 2000 FLHTCUI, and a 1984 FLHS with the red reserve tank on back.  When I need another exhaust, I will definitely call LSR for another pro stock.  It is a pleasure to be a customer. Rick".

As they say in the military  "It takes three to make a formation". LSR 2-1 Pro Stock Systems in Double Coat Black Ceramic.

FXR Instead of Dyna

Coming from Sportbikes the initial thought was to buy a Twin Cam Dyna...Instead the customer bought a 1989 FXR and put in an S&S 124 Inch Motor. Completely diassembled and everything brough to new condition...135 Hp and third place in his first David Mann bike show.  00-1306 LSR 2-1:  2" Pro Stock Challenge pipe with full heat shields.

Black& Chrome Shields

Customer writes: "Hello everybody,

First of all I would like to thank you for the excellent 2-1 LSR Pro Stock you sent me last year. Here are a couple of pics of my ride with your pipes on. As I ordered the heat shields in both chrome and black ceramic, I can easily change the looks of the bike. I finally settled on the black version for a more aggressive look !

Fit and craftsmanship are excellent. I just had to struggle a bit mounting the 2’ primaries as there is very little space left to work a tool.

What about performance?
My build is a 110ci drop in kit with SE259 cams, ported heads, 58mm TB with 4,9 injectors. I used to run it with a V&H 2-1 Propipe.
As I am a DIY tuning enthusiast, I can make an objective comparison between the two pipes. In short, it’s just another world!

Running my 4,9 g/s injectors with the Propipe, I used to stay around 80% maximum duty cycle at WOT with a 12,5 target AFR.

But with your pipes on, I shot over 95% duty cycle in the same conditions. No need to say I had to upgrade my injectors.

Considering 4,9 injectors should give about 125 rear wheel Hp at 85% duty cycle, I think my bike consistently overshoots 130hp. I haven’t dynoed it yet, I’d rather ride…

When I first ran your pipes, I got this incredible feeling to sit on an unfiltered raw engine. I could get instantly a strong mechanical feedback, like if my previous pipes would choke the engine and soften everything. These pipes really rock as hell.

Tuning was not simple, as I got a very strong reversion at midrange on rear cylinder. In finally managed to get a low rpm smooth running, and man don’t get on it if you're not prepared ! That bike revs like crazy and sounds like as NASCAR ! Sound is just incredible. Way to loud for urban use. I ride it with ear taps, mostly in the mountain, as Monte-Carlo roads begin off my backyard.

Gee, I love this bike, and I love your pipes. Thanks for that !

The only negative point about this combination is a torque dip at 2750 rpm. Bike is very strong at 2000, and a killer 3000rpm up. But it’s a little weak 2500-2750. I tried with your baffle and retuned. Obviously the baffle helps filling the engine around 2500, but in the same time it kills all the magic over 3500, where the engine is supposed to run best. Did not keep it long.

I bought yesterday a 2018 FXLR M8 Low Rider, and intend to drop in a 120ci Fuel Moto Kit (No head job, stock throttle body) and I would like you to build a pipe for this new bike. I believe you would still recommend 2’ primaries, but I don’t know if you already have a C design ou a B design working for that M8 low rider.
Are both design compatible with mid and advanced footrest ?

Feel free to publish any of my comments on your Website.



191.45 Torque

Customer writes: "Carburated MY 2000 FXSTD pulls like a freight train. 191.45 Torque.

2” C Style 124” Challenge Drag Race 00-1306, Polished Silver Ceramic
CV 51mm
SE Roller rockers
Feuling High Load Beehives
Adjustable Pushrods
Head Gasket .030
SE Clutch
Standard 5-speed transmission
422 Series Heavy Duty Shocks


Some people look at our LSR 2-1 Pro Stock systems and declare..."My Tuner says I'll lose torque unless there is a baffle". Not if you are a tuner.

Danny Arnold...151 Torque

Customer writes: "Another bad ass 124 for Tim, details make a difference… Thanks for everything over the years Danny"

Danny Arnold at DACO Enterprises has been building fast Harleys for a long long time. 00-1306 Pro Stock Challenge on one of his 124" motors. Light bike, great power to weight ratio. Chain drive to handle the power. Old School but modern power.


Customer writes: "Exhaust looks, fits, sounds great...built like a tank and fit the bike perfectly. Pic shows it fitted to my 1999 confederate GT...Have a great memorial day. Andrew"

00-1195 Confederate 2" C Style LSR 2-1 Pro Stock in Silver Ceramic with three heat shields.


Customer writes: "2001 Super Glide, 95" big bore, Woods gear drive 590 cams, 45mm Mikuni, Heads by RJ Performance, RB Pro Stock Challenge Pipe.
Was convinced by the motor builder that this was the only pipe to put on this bike when building it.  More then impressed by the craftsmanship and performance of this pipe. Huge thanks to RB Racing and Dave Slagter at Cedar Bike Repair, Cedar Iowa, for all the help. We'll show ur pipes off in southern Iowa. Dale".

Thailand Executive Chef

Customer writes: "Hi, just thought would send short a very happy with the pipes and performance. Regards Jason".

00-1306 LSR 2-1 Pro Stock Challenge with heat shields in Dual Coat Ceramic Black.

XMas Down Under

Customer writes: " Worth the wait! Sounds amazing. Give fed ex a pat on the back, exhaust came on time even with Christmas and New year’s. Is booked in for a tune/dyno in the new year. Cheers from Australia! Ben".

"C" Style Softail

Customer writes: "Here are the pictures you asked for thank you very much you have been so kind and helpful"
RSD 00-1306 Challenge

Special right side drive LSR 2-1 Pro Stock Challenge Right Side Drive.  00-1306RSD. A lot of people without Right Side Drive Transmissions say they want this pipe...Well it's configuration is pushed way out to the right for the RSD mechanism and it does not work on any non-RSD bike.

All 00-1306 Challenge designs are bike specific.

00-1306 "C" Style Challenge

Customer writes: "How's this shot? Pipes are tuned and running great. Alan". Dual Coat Black Ceramic LSR 2-1 Pro Stock Challenge. No baffle. Full coverage heat shields.

98" B Style 00-1306

Customer writes: "Just finished this build. All that remained stock was the frame, trans, and lower end. Still doing heat cycles, so no performance figures yet... If it runs as good as it sounds, we'll be very happy! I used the following parts from S&S on the engine:
98" Kit
83 CC CNC Heads
585 Gear Easy Start Cams
Premium Travel Limited Lifters
Forged Pump/Plate kit
58MM T-Body kit

I love the B Style pipe and all that was needed to accommodate the footboard was spacers. The customer and myself are ecstatic with the look and sound of this pipe! Thanks again for building another masterpiece of a pipe!

Hot Rod Todd's Custom M/C Shop LLC".

91 Fatboy 131"

Customer writes: "I finally got my 91 fatboy all done and running. I have been able to hit the drag strip a few times (I am running in the high 11's for now) and my bike sounds mean and looks pretty damn sweet with your pro stock pipe on it. My 131 big twin can exhaust like no other! It sounds like thunder when she fires up! I laugh when people roll their windows up as I cruise around town. RB Racing, you guys nailed it! Thanks for being available to us average folks!  Orin."

00-1050 2" LSR 2-1 "C" Style Pro Stock in Dual Coat Black Ceramic with three heat shields.

2008 Dyna 103"

Customer writes: "Finally got the bike all back together.  I added the SE 103" Big Bore Kit with an Andrews 48H cam to my 2008 FXDWG.  Added auto compression releases to help save the starter.  I put a pro stock on my '84 shovelhead and liked it so much I wanted it for the wide glide.  It sounds great, looks great, and the bike rides great with it.  Definitely have to wear ear plugs, I love it.  Next bike to get one will be the Electric Glide.  Thanks for your help and the recommendation to get the heat shields.  Before I put them on, I burnt the leg a couple of times. Rick"

00-1329 2" LSR 2-1 "C" Style Pro Stock in Dual Coat Black Ceramic with three heat shields.

Shovelhead Kickers and 5/6 Speed Transmissions

People ask us if their kickers are going to clear our exhausts...The general answer is yes...but that gets complicated as things get really close, so we just say "most likely" .i.e the ones in our shop clear. That does get complicated with LSR 2-1 Racing Pro Stocks (pictured below) and offset specialized parts we make.

Above: The late model FX Style folding kicker will clear our LSR 2-1 exhausts. You will have to reposition the pinch bolt slot in the kicker shaft (4 positions possible).

Five Speed Transmissions: Exhausts Clears

Six Speed Transmissions: Electric start..yes. Stock Kicker Yes...

2" Sportster Challenge Pro Stock

Customer writes: "Hey guys just want to say thank you for the awesome exhaust system on my bike love it you guys are great. Thanks, Dave."

00-1306 LSR 2-1 Pro Stock Challenge 2" in Silver Ceramic.

124" 143 HP

Customer writes: "In-house build at Daco. 2007 FXSTC 124" with a great exhaust. Thanks Danny A".

00-1172 LSR 2-1 Pro Stock, B Style, 2" in Silver Ceramic.

80"Stephen Caggiano

Customer writes: " Sorry it has been a couple months since getting the pipe, but been getting the bike back together.
1984 FLH, just finished top end.  GME 80" Shovelhead cylinder and Wiseco piston kit, 5 speed Baker Transmission, and Andrews A2 cam.  Nothing special, definitely not a hot rod requiring a race pipe.  But, I wanted a new, good sounding pipe and ran across a RB ad.  When I saw that it would fit right up, I knew I had to try it.  A little expensive, yes.  A pipe you don't really need for an old stock Shovel, yes.  I went with the Pro Stock. This was the easiest pipe I have every installed and the sound is unbelievable.

Everyone at the bike shop that hears it ask," What is it?" It does the shovel justice.  All that is left is to add the Jim's 3/4" kick start shaft for clearance.  Service was great, don't care what anyone has said, everyone was nice and helpful.  Got my second Pro Stock in the box ready to put on my 2008 FXDWG as soon as I am finished with the Big Bore 103" kit I am installing now.  I can't wait to hear it.  Thanks RB Racing for a great product. Rick".

00-1095 in Double Coat Black Ceramic


Customer writes: "Thanks for the exhaust. Looks awesome! Rick".  00-1306 for forward controls. Silver Ceramic.

Softail Forward Controls

Customer writes: "Beautiful".

Blue Magic

Customer writes: " Love the pipes!"...Darryl.

Customer writes: "I just put the finishing touches on Jeff's 07 FXSTC with an in house 124" motor" 2" LSR 2-1 "B" Style Pro Stock in Silver Ceramic."

S&S T143 with B3 Heads

143 Cubic Inches for your Dresser. Another way to spend $10,000.00 to $15,000.00 to climb the Horsepower mountain. We are making exhausts for these with integral B3 flanges. The exhaust port dimensions are not oem, not S&S SA B1 nor S&S SA B2. Go figure.

We have made custom parts for these T143 B3 ports. Available for the five product ranges we manufacture...Quiet (LSR 2-1 Black Hole) to Full Race (LSR 2-1 Pro Stock). The new two bolt/stud LSR 2-1 B3 Flange is integral, free rotating to the exhaust port. Full 2" I.D. No billet aluminum Butt Plugs or packing you have to replace.

Belts won't last on these 143T motors so we offer chain drive/swingarm conversions for 09 and later Baggers...Developed for our 360 Horsepower turbos.


A few people ask us for baffles in Pro Stock Pipes and we tell them "no"...They say they want more backpressure. Well, you never make power with higher backpressure. The real issue is that the atmospheric pressure is 15 psi and it rushes back up the pipe between firing events...that is the pressure you worry about. Pipe length, diameter, cams, fuel and ignition all figure into the events your engine sees when the exhaust valve opens..reversion and scavenging are all affected by these. All of our exhaust systems have welded-in baffles save the LSR 2-1 Pro Stock which  have no baffles. We weld them in all our other LSR 2-1 systems so they never can fly out...and through people's windshields. You ffing don't put baffles inside the 2.5" Tail section.

If you specify the Pro Stock pipe to have a baffle at the time of order we will machine the heavier wall end pieces and package up a baffle with a new tag and mounting hardware should you decide to try it at some future date. We do not install them. We do not approve of them.

The 2.250" louvered core flows about like a 1.875" cross section as opposed to the no-baffle 2.375" I.D. of the un-baffled Pro Stock tail section. The 1.875" flow rate will speed up the gas exit speeds a is not there to "increase backpressure" is there to lower the tone a bit and increase the exit speeds which can lower "jetting" figures on carburetted smaller motors. All LSR 2-1 Pro Stock Designs were meant to be run without a baffle.

If you want a baffle for your LSR 2-1 Pro Stock to install at a later date there is a $75.00 charge.

The baffle will not get past our emblem's rivets so these must be drilled out. Order a new emblem.

The risk is yours insofar as drilling your exhaust and bolting it in. When ordering you must specify if you have a 00-1306 Challenge (short tail section) or a longer length Pro Stock tail section. We are not going to drill our exhausts as we only approve welding in baffles in the rest of our products. Baffles can come out..two bounces and then through a windshield.

The word "Baffle" implies a muffler or sound reduction device. For sound reduction to occur there had to be a larger internal volume and or sound absorption media to dampen the pulsations and convert these into heat and energy loss. These are not very effective sound reducing devices so do not expect them to be quiet.

They might fool a cop on a technical, non-running standpoint but they do not "baffle" the noise.

If you want noise reduction order a 00-1306R which has a 4" Resonator with zero restriction.

Hot Rod Todd's Custom M/C Shop...140 HP Sportster

The word is this bike, with it's 2" 00-1306 LSR 2-1 Challenge exhaust, makes 140 hp. That should be enough to get one's attention. As light and fast as it is it's good it has some stopping power. Power to weight ratio is way up there.

Dixie Chicken w/ Baffle

00-1306 LSR 2-1 Pro Stock Challenge in a rigid with full heat shields and a "Pro Stock baffle". Old School...Dixie Chicken. Rubber down, paint up. Customer put this in which required drilling and rplacing the tag.rivets.

00-1155 Street Glide Pro Stock

Customer writes: "First I wanted to thank you for your patience and help. Secondly, here is a short video of the RB Pro-Stock 00-1155 installed on my 2013 Street Glide. The pipe woke the already mod'd engine up (along with the neighbors).  I've got a sh#t eaten grin on me face. Thank you and the boys for a great pipe!! Taylor."

FXR S&S SA B2 Heads

Start out with a stock FXR...Add a lot of money, redo everthing...And you end up with a big horsepower Harley that's 300 lbs lighter than a Bagger and goes like stink and stops. The stopping part is important. 00-1040 2" B Style Pro Stock setup for S&S SA B2 Heads.

Sportster Black and Red

Full custom. Light and Low. Defintely not Cookie Cutter. Love the pedals. Tires stolen from a Buick. Sportsters are Harley's racing heritage.

1st Place

Customer writes: "1st Place Colorado Motorcycle Expo"...00-1306 LSR 2-1 Pro Stock Challenge. While everyone is looking at the girl grab that money on the floor.


On second thought leave the money on the floor and grab the girl....No, on third thought the guy in the Green T-Shirt might have objections to the first two. What the hell...grab something. Go for the girl.

Sportster..Chains and Whips

Customer writes: "This is my RB Racing Pro Stock. I absolutely love the sound. This is my 2000 88 inch sportster, with hog pro wheels. Awesome product and great fitment. Michael"

Low, lean, and clean 2004 88 Inch Sportster. As they say "Belts are for holding your pants up...Chains are for racing."


Customer writes: "Here is a pic I thought you would like. Racing in Bowling Green Ky, 9-29-13. Ronnie."

Light, fast bike...Super D Carb and a 2" LSR 2-1 Pro Stock 00-1306 Challenge Pipe. Hooked up.

Bad Ass Softail

Customer writes: "This exhaust is for real. The fit was impeccable. The sound is mean as hell..The workmanship is like no other. Thank you RB Racing , for being so good at what you do, that's hard to find. Steve W."

00-1306 Pro Stock Challenge with full heat shields.

Pro Stock V-Rod Exhausts

V-Rod LSR 2-1 Pro Stock exhaust with 2" primary tubes and a sophisticated merge collector. Pure race system. 2005 CVO model pictured.

Comes complete with new mounting system. Billet gaskets required. V-Rod owners have been requesting Pro Stock LSR 2-1 exhaust systems. We're always busy so it has been difficult to tool up for these and to evaluate the designs. After testing this is what we determined the optimum configuration was.

V-Rod LSR 2-1 Pro Stock exhaust tucks in tight inboard of the clutch. Three heat shields are available: front, rear and collector.

Sportster Challenge

Customer writes: "Your exhaust system was everything your website said it would be.  It really ties the bike together does it not? Thanks,  James".

00-1306 Pro Stock Challenge.

143 Hp Bagger

Customer writes: "Attached are pictures of my 2009 Road King with a 00-1306 Pro Stock Challenge W/ 2" primaries. The motor is a 117" W/ SE Hurricane heads producing 143 HP & 141 Torque. Thanks for a great exhaust.

We now have collector shields for the Pro Stock ststems as there are so many of them out there. $50.00


Customer writes: "I need stickers.  Lots of stickers. Or anything else to support the best Exhaust Manufacturer in the entire U.S.A.!!!!!!!!!! I hate that my class is sponsored by Rush exhaust.  Their logo is so primitive."

00-1140 LSR 2-1 Pro Stock

Bad Ass 2004 Fat Boy

Customer writes: "Is it a Fat Boy? Whatever... friends say it is "bad-ass". Well, it has one bad-ass exhaust! Thanks, Jack."
00-1173 LSR 2-1 Pro Stock 1 3/4.

Rocker SE120R...146 HP

Customer writes: "Attached are pictures of my 2008 FXCWC (Rocker) with your pipes on it.  The engine is a SE120RX which produced 146 HP. Like you give a shit!! Thanks, Butch". 00-1306 Pro Stock Challenge with 2" primaries.

We only give a shit if it goes like shit. With 146 hp it should burn enough rubber and shake the ground hard enough to wake up the Rocker's creator...Willie G.

Customs..Down Under

Customer writes: "G'day here is a pic of my bike fitted with the rb race pipe you sent me the pipe fitted like a glove and as you can see suites the bike. Thank you for your excellent service one very happy customer I have no problem if you want to use this photo for your website once again thank you. Andrew".


Customer writes: "Hi, Attached is a picture of my Custom FXR, using your LSR 00-1306 pipe. Chopper Guys Frame w/3" stretch & 3" longer swing arm. 107" engine, S&S cases with Zippers Billet Heads & Barrells. Wild Things TC-546G cams. FL drivetrain. I'd love to see my bike pictured in your website".
Mark McDaniel
Backroads Custom Cycles

Customer writes: "Hey, I wanted to get you a pic of my FXR with the 124 Challenge pipe installed. I absolutely Love this pipe, and it performs as great as it looks. Thanks for making such a quality product. I will send a dyno sheet after it goes on a dynojet as I only have run it on a Superflow so far to tune it. Thanks again, Jim."  00-1306 2" LSR 2-1 Pro Stock FXR Challenge.

Customer writes: "I thought I forwarded you a couple pictures but when I spoke to you yesterday you asked me for some. I couldn’t be happier with my RB Racing pipe! It has the look AND the Performance! Mated to my 113" motor it Dyno’ed @ 126HP at the rear wheel with 124 ftlb of torque. Everyone asks about this pipe. It was featured in the DEC. 2010 issue of Iron Works Magazine. I wish I had your Fuel Injection system on this motor though."

00-1306 B Style FXR 2" primaries in Silver Ceramic.

120" Dyna

Customer writes: "Here is a pic of my 2005 lowrider with the new pro-stock pipe on it. I am running a jims 120" with 11:1 compression, ported heads and 675 S&S cams. The new pipe really gave me the low to midrange torque I was lacking with the existing 2 into 2 system i was running. The pro-stock looks awsome and sounds great! Dave".

C&S Speed Shop with a 00-1306 LSR 2-1 Pro Stock Challenge. Don't forget, Choppers are way, way, lighter than that 850 lb CVO Sled you just spent all your money on, and ones like this are set up to go and can really kick some butt. Besides they are elemental and appeal to the animal side of our nature...Like Randy Newman sings:

Hate New York City
It's cold and it's damp
And all the people dressed like monkeys
Let's leave Chicago to the Eskimos
That town's a little bit too rugged
For you and me you bad girl

Rollin' down the Imperial Highway
With a big nasty redhead at my side
Santa Ana winds blowin' hot from the north
And we as born to ride


Customer writes" "Sorry it took so long to get you this pic .I love it . Just the sound I wanted and I don't know but it seems this bike is scaryfast .This is a very special 1 right here .Thanks Dan."

SE 120R Engine

New 120R Engine for Baggers and a new AHDRA racing class...another way to get your money now that V-Rod Destroyers are old news. Think of all the early adopters who went 95/103/110 and now they can go 120". Stimulus money! If you want one in your bagger and want a full race system then our LSR 2-1 Pro Stock is about the only way you can get your maximum power as it's fully proven in competition on engines from 165 to 195 hp.

You will also need our billet gaskets, billet flanges and snap rings, heat shields, and an extra set of our special exhaust stud nuts.

As all the mythical lemmings head off the cliff we might remind them that a S&S SA B2 126" engine is rated at 154 hp and John O'Keefe at Branch O'Keefe has been working S&S SA B2 heads for big inch Sportsters, S&S 124" motors and getting 166 to 200 hp depending on compression. Of course you could get one of our turbos but the extra 100 to 200 hp might be too much power for you.

Customer Comments

Customer writes: "Hello!  Got my pipes Saturday.  Much lighter than the old D&D Fat Cat.  Yes, weight is still a factor among older, serious bikers.  Fabrication, welding and chrome are excellent.  Began installation at Perley's Cycle Shop in High Point, NC.  Perley is a long-time friend and riding partner, member of Thomas family of Thomas Built Buses.  He and I are the types who will think for an hour before attempting a twenty minute job.  We envy those people who installed these pipes in twenty minutes.  LOL!  Used sanding drum in female pipe to keep pipe from binding in collector resulting from excellent chrome build-up. 

RB's suggestion to use the black sealant is important as this lubricates the initial fitment.  Noticed increased ground clearance over D&D, I won't be riding on the collector anymore while leaning right!  Also, easier access to transmission filler.  Fired it up!  Oh, yeah!  My Harley sound is back.  Anyone hearing it will not have to guess what it is. 

Took a short ride before rain.  Surprise!  This pipe makes less noise while cruising than the baffled Fat Cat.  I always hated the Fat Cat sound at full throttle.  It was very irritating, like the sound waves would get way back in the small parts of my ears and make those little hairs vibrate.  After a warm-up, noticed increased smoothness at all RPM's.  Gradually rolled on throttle wide-open in first gear.  Felt the increased power as bike came on cam and prepared for front wheel to get air.  Tire broke loose so hard it was almost like I hit neutral.  Bike never did that before! 

Got back to shop and now Perley wants one for his California Custom.  I am convinced that as far as my bike is concerned 90% of the pipes out there are junk as far as enhancement of performance.  This pipe has everything.  Noise level is not a problem, much better than the baffled collector!!??  Will be sending y'all a pic of bike when weather clears. Have a great holiday season,  Mike Phipps  
                                                                                                                                                                                                                                                                                  P.S.  Perley asked me where were the instructions.  I replied that RB Racing expects his customers to be intelligent enough to install a set of pipes. LOL!"

HP to Weight Ratio

Customer writes: "RB Racing, I am attaching a photo of the RB LSR 2-1 pipe on this 05 Sportster that has much engine work . Pipe turned the bike into a real power house especially mid rage and RPM rev-er! Sure fooled a lot of Harley So-Called Big Bike owners! That 1200 cc smoke-ed  um!"

00-1306 Pro Stock Challenge. 

1999 Sportster 1250cc

Customer writes: "Thank you for the exhaust your shop has made for me. I had been searching for about a year before I made the decision to go with your pro stock exhaust. I spent the entire winter of 2009 installing a 1250cc kit with ported Buell thunderstorm heads from NRHS along with a set of Screamin Eagle .536 cams. It was the perfect finish to my engine rebuild. In my mind, It sounds exactly like a motorcycle should. The torque is phenomenal and standing behind the motorcycle, you can hear a clean, throaty burn that just screams power. Thanks again for the excellent product. I am recommending you guys to everyone interested in an exhaust. I will try and post my dyno results when I get it tested. John."

00-1224 LSR 2-1 Pro Stock for forward controls. Dyno...we don't need no stinking dyno. Just ride.

2008 Dyna...130HP

Customer writes: "Hello. I just wanted to say THANKS for a KICK ASS pipe. I am running a 110ci with hi comp, Moto Headz Racing heads, Woods cams and HP Inc 58mm body. After a quick dyno it pulled some great #s 130.1 hp and 139.9 ftlbs. Thanks Mike."

00-1329 2" LSR 2-1 Pro Stock in chrome. Eats rice burners.

124" Twin Cam in a 1992 FXR

03-1040 2" B Style LSR 2-1 Pro Stock in a 1992 FXR Chassis. Wob's Cycle Shop did the deed. FXR's rule...or as they say at Elvis' Place " FXR or Die".

121 TP and Ape Hangers

Customer writes: "Hello once again, here is another customer of mine that is enjoying the benefits from your exhaust pipe . Bike is a 1998 softail that has been customized through the years with a 121 TP motor. Customer mostly enjoys the top end the pipe produces and the one of a kind sound. Thanks for posting the pics everyone loves it. Thanks Dave.Wob's Cycle Shop Wall, NJ."

00-1040 B Syle LSR 2-1 with 2" Primaries.Who needs deodorant when you've got ape hangers...a thin coating of road grit is safer then smearing Aluminium zirconium tetrachlorohydrex gly under your arms. Then again, the girls like things that smell nice...Get out the deodorant and the cologne. Nasty looking thing isn't it?

Customer writes: "Hello and I was asked by you to send some pics when I had the LSR 2-1 Silver Ceramic Challenge pipe installed on my 2004 Big Dog Chopper. Well, they run great and here is the picture as promised." Allan.

150 Hp Bagger

Customer writes: "Here is a pic of my 98 road glide with a S&S 124 B-2 head engine (see SA B2 pictures below) and your LSR 2-1 Pro Stock 124 challenge pipe. The bike is 250i dyno tuned to 150 hp and maximum torque. This pipe is my 3rd pipe I have purchased from your shop, the other 2 pipes were LSR 2-1 C style and the sound and power these pipes make are number one. I honestly don't know why anybody would buy anything else. I will run RB Racing pipes as long as I ride. Thank you for such a awesome product.......Randall".

FXR Pro Stock C Style

Customer writes: "Here are a couple of pic's of my 1982 FXRS Shovelhead, which & installed your Pro-Stock pipe on. Love to see it on your site! Btw, pipe is AWESOME! Thanks...Bob". 00-1097 in Black Ceramic.

Shovel...Later On

Customer writes: "Heres an updated pic of my Shovel. You guys have the "old" version on your Shovel page. This is what happens during the long Pennsylvania winters here when I get bored. Just a few beers and a cut off wheel and I'm good to go. The pipe is still looking like new and making great power. Keep up the great work! Dave."

More Pro Stock..86" Stroker

Customer writes: "What can I say, a bad ass pipe for a bad ass Shovel. I have had this bike for 25 years and it was built 15 years ago: 86 c.i. S&S stroker S&S Super E carb, and a Crane Fire Ball cam. It always ran pretty good with straight pipes. I thought about a Thunderheader but I would have to modify it to fit, then a friend told me about RB pipes, I saw that they made one for an FLH that fit right on and it f#%#kin fits nice looks great, It isn't even dialed in yet and guys with new 96in baggers are on it to keep up, It put new life into an old bike that I love to ride. Thanks guys. Frank"

00-1095 in chrome.

93" Shovelhead..Old School

Customer writes: "Here's a pic of your pipe on my Shovel. Its a 93 inch S&S stroker kit, 514 cams, Super E carb. The fit, chrome and workmanship on this pipe are fantastic, Im very impressed. If anyone askes how this pipe sounds you can tell them its all Harley. Its deeper and stronger sounding than ever. Whats really impressive is how hard the bike pulls from 3 grand to about 6000 RPM. The time between gear changes is much quicker than when I ran drag pipes.

I have some sorting out to do with the carb which I expected. The only bitch I have is how long it took to get the pipe!!!  The mounting bracket you sent needed to be reworked and spaced out but thats no big deal. Anyway, Im very pleased with the pipe and will be looking for one for my wifes softtail in the future. Thanks, Dave"  

It's a miracle we still make these. Lucky it's short term memory that goes first. 00-1094 Chrome Pro Stock 1 3/4" B Style. It is fun to outrun a new Twin Cam bike though.

Customer writes: "Greetings RB Racing Staff. I am sending you a video ( no longer online) as well as a huge thank you. I was in the market for an after market exhaust for my father's 1977 FLH Shovelhead. I had no real idea that there aren't many options for the older bikes. I searched through miles of internet junk until I came across your brand on a forum. I had never heard of the RB Racing product before so I quickly became interested after visiting your web site and seeing that you had exactly what I would need. I sent one question in an email and got immediate feedback. I settled on the 00-1097 C style in a Titanium finish.

The research I had done had me a bit concerned over the amount of time it would take to get my pipe after ordering it. I ordered in the first week of November on the web site and was hovering at a month when I sent an anxious email. Lynn got back to me that day with the tracking number telling me the pipe was on its way. It arrived December 14th, which worked perfect because my Dad's birthday is the 15th. Probably the coolest birthday present he has opened in a long time.

I'm no mechanic. So when we took off his old straight pipes and started with the install on this I was a little skeptical. I was so happy when we had the new LSR's on in about 20 minutes! The gaskets fit perfectly, all the bolts and brackets were a tight seamless match and the system is on so tight that you could stand on them. The research and design put into this system is outstanding. I had figured we would have to do some adjusting with the rear mount for the simple fact that nothing goes on without some issue. There was no issue, snag, or any sort of problem.

 The video is from March 7th. One of the first real sunny days here in Connecticut. We have not had the chance to put any real mileage on yet. There have been a few trips around the block to get a sense of how the system acts. I was surprised to notice that when you are riding it has a smooth, subtle rumble. With the pipe being behind the ears it makes a big difference rather than having the front pipe on a standard system right below you. But make no mistake, the pipe is LOUD! Down shifting and letting off makes that thing bark to no end! Awesome! The performance difference was noticeable as well. There is a much quicker response at the low end which gets the RPM's up quick. The bike is fairly built as it is so this only helps it be a super sleeper.

I can't wait to see the looks it gets when we do get out this season. Who has a Titanium pipe? Who knows about RB Racing here in CT? We do. And we are going to be spreading the word going forward.

 Again, Thank you for making such a superior product. We will be enjoying it until that bike runs no more. Mat"

S&S SA B2 Bonneville Porting

Whenever we do something serious like our 139" Bonneville ORCA motor we defer to the experts, especially when we are dealing with raw, unfinished ports the size of a dime. Branch O'Keefe is simply the best in the business and even Jerry Branch (retired) got involved in the decision making. Take a look at some ports that about 90 years cummulative experience came up with. All John O'Keefe and Jerry Branch asked was what we thought the exhaust ports should be like in terms of flow based on our 30 years of turbocharger experience. We all agreed on a number and this is what the result was. Ports for 400+ horsepower.

John does the Bonneville  porting of our S&S SA B2 heads. Quite a few baggers are going 124" with SA B2 heads...John has pushed these out past 200 horsepower normally aspirated, winning horsepower shootout contests and running hard at Bonneville. He knows how to improve them which is why we asked him to work on ours. We make special exhausts for the S&S SA B2 heads with their raised ports and four bolt shallow pocket configuration. John has pushed his B2 porting past 200 hp.

If you want the best cylinder head work for your Twin Cam, Evo or even Shovelhead contact Branch O'Keefe. That's what we do and have done since 1976 when Jerry prepared our cylinder heads for the 24 hour Endurance racers we built and took to the 1977 Bol D'Or in France. John O'Keefe knows you don't want "down time" so he has an exchange program for cylinder heads. Harley has made a lot of changes in their castings and it's best to go with Branch O'Keefe as differences in machining, alloys, and specifications can cause problems if you deal with porters who don't have the inventory and the experience.

John does not have "homing pigeons" like other outfits where seats come loose, the work is sloppy, or cheap valves that stick or gall are installed. He treats every head they produce as if it was his own. Sort of rare these days.

103" Porting and Pistons...Stock Heads

John O'Keefe of Branch O'Keefe has 103" kits for late model Twin Cam engines. Stock 103" engines from Harley make maybe 80 horsepower. This just doesn't cut it. Branch Specifications: Larger inlet and exhaust valves; .060" decked cylinder head; compression releases; new valve guides; racing valve springs; flowed inlet and exhaust ports; forged lightweight pistons contoured to match quench style combustion chamber; and BP-600 Branch camshafts. Not a bad idea to get a matched, proven, combination.

We've ridden a few of these and they work well. Compression is about 10.7:1. A lot of guys are going with the 103" engines.

2" Shovelhead Pro Stock

We hand make all our LSR 2-1 Pro Stock systems but a 2" Shovelhead requires a lot more work. Sort of an odd request, but this one is for a long term customer of ours who has set numerous records with Shovels with our exhausts and is now planning to go to Bonneville with a built 113". The pipe is a 2" LSR 2-1 Pro Stock 00-1381 and is headed off for a Silver Ceramic finish. Customer runs a ported Super"D" with Thunderjets and a ram air system.

You can't get a 2" pipe at the ports as we can on our other systems so we have to "bell" the 1 3/4" into the 2" primaries. Front primary slips and the exhaust is designed for the taller engine. The customer asked for O2 ports so we installed them. We do not sell "raw" systems.

On all Shovelhead pipes, including this 00-1381 Chrome 2" Pro Stock, the front primary tube is a slip fit. We do not offer heat shields for Shovelhead designs.

The front primary tube has an Oxygen Sensor Port as we have done for over 20 years. You can use a RSR Air Fuel Ratio gauge to monitor ant set your carburetor's fuel mixture.

2" Shovelhead B Style (FX)

00-1382 LSR 2-1 Pro Stock 2" Shovelhead for stroker FX series. Headed for Silver ceramic coating. Old iron, but fast old iron. We do not sell "raw" systems.

1 3/4" Shovelhead Pro Stock

93" and "Bad to the Bone" with Branch O'Keefe heads. Shovelheads are back and they will surpise many a Twin Cam owner. Old School is new school. LSR 2-1 Pro Stock 1 3/4" 00-1097 in chrome.


Customer writes: " Your pipe freakin ROCKS! I got it delivered to the shop...6 hours after it was supposed to be there(PLEASE, FIRE FEDEX, their 'Ground' service sucks!) Since I helped out a bit in the shop, I got everything done for $60 to include a pair of 'stock' exhaust flanges. My big fat thick SS flanges would not fit, but it's cool.

We got the pipe on, and everything mounted up with loctite and Ultra Black right nice. 'American Heat' looks real good wearing it. Fired it up, and all I could say was,"WOW!" My buds and I call it LAF!, or Loud As Fuck! Yeah, it was inside the shop. Outside as I left, it just sounded real good, like it should have. Out on the road, holy shit, it went like a scared cat when 'American Heat' came on cam and went full song. Front wheel comes up in each gear from a dead stop (and a 3000 rpm launch).

I gotta say, I am always looking at the Silver like I should have got Black, but shoot, it looks freakin SWEET! I LOVE IT! I attached some pics for you guys. Thank you for making this special for me. The slight upsweep really looks good. Maybe in a few years or so I will be ordering my next one depending on when I build my bobber. I am set on an S&S Flathead Power Knuck, but it will have to have a chrome LSR but with the requisite Fishtail at the end to fit the look of a 1947 Bobber just right. Once again, THANK YOU! YOU GUYS ROCK! James".

00-1140 in Silver Ceramic.

EFI and LSR 2-1 Pro Stock


Screaming Eagle Super Tuner...SEST (discontinued)

"SEST" or Greek for the worst written instruction manual we've ever seen. We defy you to figure out how to get various charts and graphs to open and how to get to the advanced versus basic tuning options. We suggest you look around the internet as the manual is of little help.

A number of years ago we bought one of these to see what was involved. If you can figure out the software navigation issues and install a map that somewhat matches your bike, you simply ride around, observe the RSR Air Fuel Ratio Meter display and make edits. The tuning was fairly straight forward. Without the Dual Gauge we don't know how you would do it. We just ride.

Harley had to recall these after being fined. They are no longer available. Newer versions are limited.


Whenever you look at an exhaust and see it caked in black soot you know the bike is not running or tuned correctly. Back in the mid 1980's we did a carburetor development program for Keihin Corporation for their 41mm CR Race carbs on both Shovelheads and the new Evolution motors. When we were finished the bikes got 56 mpg cruising and 46 mpg if you ran them harder...and after 500 mile tests the pipes were perfectly clean inside and the exhaust ports were dead clean.

If you take the exhaust system off a modern Closed Loop BMW, as we have, you will find them dead clean or whitish inside. Harleys should be the same.

We always ask what mileage people get from their "tuned" or modified Harleys after "Dyno tuning"....The universal answer is 37 mpg or less. If they don't know, we ask them if they have to gas at 100 miles. Most do.

Once a customer bought an exhaust from us and took his bike to two different dynos in search of the "117 Hp" he was looking for for his 103...He got 110Hp. After pissing and moaning we told the guy to give us our exhaust back and we found it caked in soot. So much for tuners and their tail pipe sniffers that see lean reversions...They just kept adding fuel. You tell the customer to put on our RSR Air Fuel Gauge to monitor the mixtures F/R in the real world...No, they want a "Dyno Tune". We have dynos...we know what they do and can't do.


Pictured above is the exhaust port from a 2017 Dyna Low Rider S with about 100 miles on it. No soot. Delphi engineers seem to have done a very good job. Looks like the port you would see on a BMW. Now, when your "Tuner" gets finished with it, it will most likely be full of soot. Logic plays no part in people and their toys. EFI is complex...put in different cams, change air cleaners, port the heads and all this goes out the window. Brave new world.

No soot.

Fuel Injection..A Reality Check

OEM Harley Delphi Injectors come in various ratings: 3.91 grams/second; 4.35 grams/second; 4.89 grams per second (CVO); and 6.00 grams per second. These ratings are static i.e. shorted open. Pulsed static is about 90% of this i.e. what you could expect if you maxed them out in your ecu calibration software. If you hold them to an 85% duty cycle they, respectively, offer the following horsepower potentials: 105 hp; 117 hp; 131 hp and 161 hp. Now, you can squeeze more out of them by going past 85%, but this is the point where they are still controllable.

We get calls from people building wazoo big engines and they are still running the stock injectors. We suggest you get the right injectors for your engine building projects. We offer a several calculators for those messing with efi systems. Fuel Injector Calculator   Professional Injector Pulse width Calculator.

To see what lengths we go to to control 360 hp on turbos take a look at our Road Glide Fuel System.

Band-Aid...Not Needed

If you have a late model Harley with a Fly-By-Wire throttle you do not need an add-on gizmo. We suggest you get Steve Cole's TTS Master Tune software described above. When purchased with RB Racing exhausts and turbocharger systems we offer a $50.00 discount i.e. $375.00 v $425.00 list. TTS MasterTune allows you to adjust your electronic throttle without the expense of additional add-on devices as well as your fueling and everything else in the Delphi ECU.

New Small (12mm) and Older (18mm) O2 Sensors


In 2010 FLT/H series went to the new small heated O2 sensors. The Dynas and Softails went to these in 2012 and the Sportsters in 2014.

We are tooled for these smaller sensors on all the newer models. The small O2 Sensor models have a floating ground voltage offset that has a complex scheme that varies the signal to meet emissions purposes. If you think you are going to trick these you are in for a surprise.

You must specify the year of your motorcycle when ordering the RSR Dual O2 Gauge. Models with the small OEM O2 sensors will require two 18mm O2 ports in addition to the 12mm ones to monitor your bike as you ride. Our RSR Dual Gauges will monitor the 18mm high temperature O2 sensors we supply. It is the only method to monitor both front and rear cylinders of your bike as you ride. Real world observations to perfect your tune. Better than a dyno which tends to overheat your motor quickly skewing your tune.

RSR Air Fuel Ratio Gauges...Real World Tuning

The Mother of all gauges! Not a gauge, but a precision tool that will tell you exactly what your engine is doing in real-time. Gives you instantaneous read-outs of air/fuel ratios from 17:1 to 10.5:1 and indicates maximum power ratios. Four color display is easily read in direct sunlight and automatically dims at night. Waterproof, billet aluminum construction. Your significant other will cheat on you but this gauge will never lie! It won't keep you warm at night, but a perfectly running engine will look and sound the same when you wake up next to it the morning after.

Single RSR O2 Gauge: Reads the front cylinder in non-efi models. It is simply the best way to evaluate the tune of your motorcycle and saves expensive and often inaccurate dyno time. Real world tuning while you ride...Observe and then make adjustments. Mounted permanently. Waterproof.

Dual RSR O2 Gauge: Compatible with OEM narrowband sensors. For non-closed loop models (1999-2007) we can supply the LSR 2-1 exhaust with two 18mm O2 sensor ports and two high temperature Bosch O2 sensors: Part Number 06-1026. Real world tuning while you ride...Observe and then make adjustments. Mounted permanently. Waterproof. Use TTS Master Tune Software to adjust the VE tables for the front and rear cylinders.

Mounts....Roll Your Own or Buy One

The gauges have a center back mount 5/16" x 18 x 1/2" Stainless Socket Head Cap Screw and stainless lock washer. You can fab your own bracket for this or use the 06-1025 hard anodized Billet Mount System for either 1.00" or 1.25" handlebars $49.95. Optional is the 06-1024 two piece laser cut 304 Stainless Steel mounting tabs for either near handlebar clamp or up the handlebar mounting: $9.95.

Tune in the Real World: RSR Air Fuel Ratio Gauge

Since we have been doing closed loop fuel injection systems for Harleys for more than 30 years and have been putting O-Sensor Ports in our exhausts for the same amount of time, we have both single and dual O2 ports for our full range of exhausts. Our RSR Air Fuel Ratio Gauge is the best investment you can make for monitoring and optimizing your engine tune.

All LSR 2-1 exhausts come standard with one or two O2 ports (Sequential EFI models)...18mm or 12.5mm. O2 or Lambda sensors are a necessity for either carbureted or non closed loop efi (Weber Marelli and Early Delphi) Harleys. We should know, as we have a lot of experience with them and have been doing Closed Loop EFI systems since 1989.

The Single and Dual gauges ship with six feet of MIL-W-22759/32 wire. The first 24" is Raychem DR-25 sealed on both ends. If you wish to have a connector at the 24" point there is a $50.00 charge to install either six position (single gauge) or eight position male/female Deutsch DTM connectors with Raychem DR-25 sleeving.

The gauge is housed in a hard anodized round enclosure in a standard 2" format with a 2.250" bezel, center back mount, with a 5/16" x 18 stainless socket head cap screw. The gauge will show fuel ratios from 17:1 to 12.0:1 (or richer). The gauge is visible in daylight and automatically dims for nighttime operation. Only a single L.E.D. illuminates.

Very easy to interpret at a glance. Scale is, left to right, lean to rich: three greens, three yellows, two orange and two red l.e.d.s. You simply cannot "read" spooling digital numbers.

The white arrow indicates the maximum power mixture, the second orange light, which is 13.2:1. Transitory enrichments should not, if the engine is warm (>200F Oil temp), go past the first red light. Readings at the far right side of the scale, the second red light, are simply too rich. Proper closed loop operation will cycle back and forth from green to orange around the center of the display.

It is simply the best way to evaluate the tune of your motorcycle and saves valuable dyno time. Mounted permanently. Waterproof.

Whether your bike is carb or efi this is the best way to tune...By riding and observing, not on a static dyno. Dynos are not exactly real world in terms of loads, airflow, or transitionals, and even if you had a million dollar AC Transient dyno room, you would still have to do real world testing. The gauges are dead accurate and are millisecond fast responding which makes it very simple to interpret or remember, even at a glance, while you are dodging cars watching for cops. We have a Superflow CycleDyn which gives a better real world correlation than other dynamometers but we still evaluate air fuel ratios when riding.

Anyone who tells you optimizing tuning is easy is full of shit. Engineers at Ford say they spend two years just perfecting tip-in or initial throttle openings. Ride, observe,..then change or edit. Real world.

Pretty soon Harleys will all be watercooled then you really won't be able to tell the difference between Milwaukee and Hammatsu. "The Man" will be sniffing your butt and planting microchips and gps modules up your ass so they can mail you a speeding ticket and keep track of your movements. They already have data recorders on your car so they know what you were doing when the biggie happened. Brave new world. Monitor your engine to get the most out of it before the NSA monitors your tail pipe.

 Customer Comments

Customer writes: "When the gauge arrived I knew it would be of a very high quality, it has far surpassed my expectations. I was very eager to get this installed and take a look at my tune.  Amazing to see how little adjustments on the carb effect the AFR. As a result of this gauge, I have dropped one size on the low speed jet, raised the clip on notch and confirmed the main jet on my Mik48. Thank you, I really like this gauge. Ed"

"Just wanted to follow up with you. This AFR gauge is a game changer. I think the tune on this bike is just about perfect, or as perfect as a one can get with a carb. I have every needle, main and idle jet available for the Mik48 and think I used everyone of them chasing the tune. Now with everything dialed in, warm idle will flicker between the orange and red light, cruise is at the left orange light and hard acceleration toggles between last orange and first red. Plugs look terrific, bike starts first thing in the morning without any choke, while riding around town the lights are relatively stable, some moving around but not much. Again, I couldn’t be happier with how this gauge works.

I am building a 124” TC to put into another FXR that I am building. This gauge is already on the build list, can’t imagine not having this gauge on any of my bikes. Thanks, Ed"

Customer writes: "Sounds like a FAST Harley!  Revs quicker.  Everyone that knows the bike immediately notices how the engine has better throttle response now.  One blip of the throttle is all it takes to spark envy.   It has a noticeable volume and powerful sound on acceleration complimented by a smooth deceleration growl.  Cruising volume is somehow arguably quieter than the V&H slip-ons that were on the bike previously. 

The chrome is flawless.  Packaging was excellent.  It’s amazing how spot-on the fitment of the slip joints are.  The mounting bracket is perfect in form, fit and function.  Everything eases into place with a slow methodical hand.  Don’t force or rush the installation and you will complete it without frustration.  I bought the Dual AFR meter at the same time as the pipe.  I cannot imagine an easier way to tune with my TTS MasterTune!  I was able to actually improve the tune and power while maintaining 43 mpg. Thanks! Ryan"

00-1316 LSR 2-1 using RSR Dual Air Fuel Ratio Gauge.

New Exhaust Tech Section

We have given a bit of an overview on the design of Harley Davidson exhaust systems for those who have questions about primary tube length, tube diameters, collector design and the pulsations and wave timing in a V-Twin engine.

Pictured above is 00-1306 LSR 2-1 Pro Stock 124 Challenge pipe. Available with standard port (2 stud) or B2/SA (4 bolt) cylinder heads in silver ceramic, black ceramic, SS Titanium ceramic or in chrome finishes. Specify chassis/transmission for appropriate mount system. This one is getting a Silver Ceramic coating. We do not sell "raw" systems.

Lynchburg Harley-Davidson has been getting 135hp and 145ft/lbs of torque on 117" TC88 street motors with these exhausts. 124" S&S engines have been dynoed out to 165hp in street trim.

Customer writes: "Dear RB Racing: Ray here, just wanted to send you a picture of my 05 Sportster with your LSR 2 into 1 Pipes. I have 2500 miles on them and no problems. They sure sound great and turn my 88" NRHS built motor on.  Thanks for making a great looking and HP producing set of pipes.  Ray". 00-1233 in SS Titanium.

Sportster 2" Challenge Pipes

00-1306 Sportster LSR 2-1 Challenge Pro Stock Exhaust with 2" primaries. This one is getting a Silver Ceramic Coat and being instrumented for a RacePak Data Acquistion sytem with EGT probes as well as with our O2 outputs. We added two 1/8" NPT nipples for the thermocouples and two 18mm O2 sensor bungs. We do not sell "raw" systems. Tuning is done with our RSR Air Fuel Ratio Gauge.

Drag Bike

Customer was switching from Duals on this stroker Sportster drag bike. Stroker Sportsters have taller cylinders and we have special jigs for them. Here a 2" Challenge is being trial fittied prior to Ceramic finishing. The bike is light so it should do well.

Customer writes: " Just sending a couple of pix of new exhaust that I received Friday. It fit great. One question I had ...Do the billet gaskets get used by themselves or with another gasket? Please clarify this for me. I also want to order an extra set of these gaskets. Thanks again. Gary". Pipe was coated in Silver Ceramic. We do not sell "raw" systems.

You must use the billet gaskets and remove the OEM woven ones. No silicone sealant is required, just a metal to metal seal. The Billet Gaskets do not wear out.

Show and Go 2002

Here is a picture of my 02 Fatboy, 1-3/4" C style Pro Stock. This pipe was a great addition to my bike. I have more power down low, and the hesitation I had off idle is completely gone. In short, this pipe ROCKS! I absolutely love it. The fit, finish, sound and performance are second to none. My bike has a Branch O'Keefe 95" kit consisting of #4 heads, JE 10.5-1 pistons and Branch .595 gear drive cams. This is not your average build and it wouldn't run very well with an average exhaust. Thanks guys for GREAT, FAST service and a wonderful product. The only thing I don't like about it is all my buddies are wanting one LOL.." Thanks again, Daren.

LSR 2-1 Pro Stock 00-1070.

Big Inch LSR 2-1 Pro Stock

Customer writes: "Hi. Attached are pictures of a 2001 Dyna Glide with RB Racing LSR 2-1 Pro Stock Pipe on a 124" motor and a 2006 Street Bob with RB Racing LSR 2-1 Challenge Pipe with a 117" motor. Pipes work awesome! Mike"

Sportster 1 3/4" Challenge Pipes

Customer Writes: "Hello, I attached a couple pics of your pipe on my bike. The craftsmanship is second to none, the bends, welds, and merge collector is a thing of beauty. My power seems to be much smoother and past 3500-4000rpm it really kicks in. You definitely have my endorsement!! I'll get some better pictures for you and if you want to post them on your site I would be honored." 

"I got the pipe; I was pleased with the packaging. The fitment was precise. My first run I shaved .07 off my time, now a new personal best. I am very happy and would highly recommend it to anyone wanting to go faster. But I will warn them of just how much faster the revs turn!!!!!!!!!!!!!!!!
Faster revs mean I am moving that much faster as well. I now need to play with my shift points."

It's a 04 1200 R Sportster w/ a 18"x5.5" v rod rear wheel, chain drive, and tokico 6 piston rear caliper.
Thank You" 00-1306 Sportster Challenge pipe in silver ceramic.

Wind in the face, redlining the gears, ripping the air, acceleration pushing your fingers into the grips, front wheel light hitting the bumps...fuck Disneyland! E-Ticket in a cookie cutter world.

Soon To Be...Ralph

Ralph's toy. Destined for an LSR 2-1 Pro Stock Challenge system. It takes time and money, always more than you planned for.

Sportster Challenge...Ralph Running

Acceleration. Power. Lower moment of inertia. Traction. Try to cheat the wind. Beat the other guy....get the trophy. Early on we chase the girls and can't afford to chase the trophies. Later on we chase the money, dance with the Devil, and, if we're lucky, get the trophies. Hard to do both at the same time. It's never easy. Some people do both and the rest of us take pictures of them. Ralph.

2" Sportster Challenge

Hot Rod Sportster in a rigid frame. Never enough time for your own projects as you have to make a living. They get done eventually. Hot Rod Todd.

S&S B2 Heads

ORCA Motors use big valve S&S Special Application B2 heads mated to the Closed Loop RSR Fuel Injection .

Four bolt flanges and special fixtures designed for the raised ports. O2 port on front cylinder standard. Second O2 port on the rear cylinder optional. 00-1306 2" LSR 2-1 Challenge pipe for an 113" ORCA motor pictured above.

If you have a very tall motor like a 145" S&S with the B2 heads we have to lengthen up the primaries by lowering them for the taller engine. S&S uses these in their Dyno testing and on thier "Mule" test bikes. How ere make the front pipe is a bit of a variable due to chassis differences. Some aftermarket frames like the Chopper Guys FXR will have additional clearance for the front tube.

TC Softail

Customer writes: "Love the pipes!!  Just got'em dialed-in, rolled on the throttle in 2nd gear and broke the tire loose! (I mean it BROKE LOOSE!! Never did that before!) Made me very happy! Love the sound nice cruising and obnoxious when you rip on it,the way it's supposed to be. They really fit good,no problems about 2hrs. to install. Really want to THANK YOU for everything. Motor was puttin out 104hp. & 98 tq. on the dyno. When I dyno it with the new pipes I'll give you the #'s if you want. Could not be happier!!, Thanks again,  Randy W."

00-1306 Pro Stock Challenge with 1 3/4" primary tubes in chrome.


Customer writes: " Got your pipe yesterday and this morning I installed it without any major problems. The fit is very good and the plating is the nicest I've seen ever. The bike sounds like a bike should; throaty and powerful. Compared to my V&H header, the RB unit comes on sooner and pulls till redline with no flat spots. When I dial in the carb it will be just awesome. It's damn close right now. Thanks again for putting the final touch on my 80 inch asphalt eater. Al "

00-1068 Chrome LSR 2-1 Pro Stock.

Busa Beater...Chrome Buffalo

Customer writes: "This is Mike D. in Georgia.  This is a picture of my bike, The Chrome Buffalo, which you asked for.  I have not dyno’d the bike yet, but I can tell you she is evil...once I got the clutch straightened out.  This is a TP 121 #58 that has been re-built to 2007 specifications (new heads, oil pump, cam, etc.)  The only problem I have now is putting the horsepower on the ground.  Love the pipe, we at the shop decided to not put the chrome heat shields on.  The sound is unbelievable, and definitely a head turner when I come through.  There is nothing like seeing the jaw wide open of a Hayabusa owner who just got blown away in a 1/8 mile run by a Harley."

RSD Pro Stock Challenge

Customer writes: " RB racing: Here are some pics of RB Racing pipes on a custom bike I just finished. It is a Pro Street Frameworks FXR style frame with a 114" TP motor (yeah one of those billet motors) and a custom open primary. Had fun building this one, will talk to you about a motor for the next one. Love the pipes. Thanks, Doc"

00-1306RSD LSR 2-1 Challenge pipe in chrome. 2" Primaries.

Not So Mellow Yellow...165 HP

00-1306 124" Challenge Pipe, Chrome, 2" primaries. Whitewalls with some balls. You can run the "B" style pipe if you space the floorboards.

Customer writes: " Thanks RB Racing for your tremendous exhaust pipes...the LSR 2-1 Pro Stock 124 Challenge pipe. I used all the top brand exhaust systems from Bassani, Rineharts, Thunderheaders to Vance & Hines Pro Pipes. None of these pipes even came close to making the power your LSR 2-1 Pro Stock 124 Challenge pipe made! Keep up the great work!"

"My bike is a 2001 Fat Boy with a 124 cube FI motor with T-Man Heads and Cams built by T-Man Performance. 165.38 Horsepower and 158.16 Ft Lbs of torque. Torque peaked by 4500 rpm and the horsepower was going straight up when we shut it off at 6000 rpm!"

If you do a little thinking you can see it will be back in the torque when you shift. Makes it easier to pull the next gear. Transient acceleration is what wins races. Watch it on Video.

S&S Twin Cam Oil Pump

If you are running one of these and want a "C" Style Exhaust for your Twin Cam engine let us know as we have a different type "C" Style exhaust that fits these pumps. If you are running a normal cone then there are no fitment issues. Our regular "C" pipe goes up close to the original cone. In the case of the S&S pump pictured above we have to route the rear pipe differently due to the "block" shape.

"B" Style pipes are unaffected by the S&S Oil Pump design.

2005 Champion

Joe Boyd won the 2005 AHDRA S&S Super Stock Western Division Championship with his 00-1306 Challenge pipe on a 113" motor. The pipe dropped his E.T. three tenths...or maybe it was the track, or maybe it was his tuning. Who the hell knows? But he won, and that's what counts. Congratulations to Joe and his crew. We all try hard. It's all we can do.

2006 Champion

"Hello to Bob, Lynn and everybody else at RB Racing. Thanks for the awesome 124 Challenge pipe it kicks some serious ass. 2006 AHDRA season we won the Western Super Gas Champion Ship running your pipe on a TP 113 for 2007 we will be running a TP 124, and from testing this bike is going to be fast!!! I can't figure out why anyone would run anything other than a RB Racing exhaust. Go figure. Anyways Thanks for the pipe, you guys rock.... Joe Boyd"

Actually the pipe is just a small part of the puzzle. Buying one won't make you a champion. We might have something new for Joe in the Spring. It's just another part of the equation. For those of you who don't drag race we would just remind you it is a brutal sport. The smallest hesitation or error and you are on the trailer. Sort of like in the Army and the Drill Sergeant reminds you there are two types of Bayonet fighters..."The quick and the Dead".

RSD Pro Stock Challenge

Right side drive. LSR 2-1 Pro Stock Challenge. 00-1306RSD.



Jeff Richardson (see contact info above) works 24 hour days to build bikes like these. Matador red, like waving the flag at the bull. One-off customs that you can ride daily. "Fat Ass Toys" as Jeff calls them. Electrics that work and a ride that won't leave you stranded. LSR 2-1 Pro Stock that Jeff had high temperature coated locally. Arlen who?

Softail 124" Challenge Pipe

00-1306 Challenge pipe on a 124 " S&S motor. Customer loved the pipes then bought a stupid set of billet heads with non standard ports. We only make these pipes for standard ports or S&S Special Application "B2" or "SA" heads. Stay away from the billet crap. We don't custom make these for stupid heads.

Hard Tail Challenge Pipe

127" rigid with a 00-1306 Challenge pipe with Silver Ceramic finish. Black rubber streaks in the asphalt jungle. Old school rules.


LSR 2-1 Pro Stock - 12 Degree Merge Collector - No Baffles

Focused power! The smoothest internal construction of any 2 into 1, without any baffles, bumps, shelves, or sharp turns. Hand-made merge collector is expertly heliarced and just as smooth on the inside as it is on the outside. These are real formula one stuff for your 1908 air pump and don't have any baffles in their 2 1/2" diameter tail section. Don't ask us for baffles because we won't put them in there as the i.d. of the tail section is optimum as it is. These are special animals for high compression, high horsepower engines that will rip the the air like a P-51 Mustang under full boost.

We make these in both 1 3/4" as well as 2" primary tubes in both "B" and "C" style variations for most models...Most of them end up on high compression big inch motors (the far side of 100 c.i.) in a 2" B Style, typically on an FXR chassis. If you need a 3/8" offset for your wide tired Kenny Boyce creation or if you have some 3/4"taller cylinder arrangement be sure to tell us before you order. If you want to make more power you simply have to run one of our LSR 2-1s.

Pictured above is Wellesley and family of Lynchburg Harley Davidson. Pipe is a 00-1127 2" Dyna Pipe. Another picture of the bike is lower in the page. Yes, they actually do get raced. No, they just aren't another custom pipe with a racy name.

Mid Peg B Style

Mid peg Dynas and FXR's can get tight with brake pedals, frame bosses and peg mounts. It seems we were always making adjustments over the last 20 years to account for changes in oil filter location, clutch cables and oem engine case changes. Evos, Dynas and aftermarket variations of these two.

Customer writes: " Excellent product, great fit, great looks, great function. I will be ordering for my Fat Boy and other scooters. Thanks" 00-1126 in Silver Ceramic.

Road Glide

LSR 2-1 Pro Stock in Silver Ceramic on a Road Glide.

Customer writes " Hi, sending a photo of the Pro Pipe installed on my Road Glide. (Purchased pipe through Heritage Harley Davidson, PGH, PA) Love it! PLENTY OF GOOD COMMENTS! Thanks for a great product! PS - I know that dyno numbers don't mean everything, but here they are for a 95c.i.: 107.5 Hp 105 Torque."

B Syle Softail (Titan)

Probably the best time to look at one, when they are parked. Otherwise they are all go. 00-1068 LSR 2-1 Pro Stock with heat shields.

New 145" S&S Tribute Systems

We have been asked by S&S to provide LSR 2-1 systems for the 145" S&S Tribute engines. We have tooled up to produce three versions for the Dyna and FXR style transmissions. It does get complicated however.

If you have a very tall motor like a 145" S&S with the B2 heads we have taller primaries for the taller engine. S&S uses these exhausts in their Dyno testing and on their "Mule" test bikes. How we make the front pipe is a bit of a variable due to chassis differences. Some aftermarket frames like the Chopper Guys FXR will have additional clearance for the front tube.


LSR 2-1's Bonneville,Dyno &Track Proven

If you want to make power on a multi-cylinder engine you have to use a collector system. Whether it's a V-Twin or a V-8 it's the same, and no less an authority than the famed engine builder Smokey Yunick will tell you that. Not using free exhaust energy to help your engine breathe is downright criminal. No matter what the conventional wisdom is, staggered duals on a Harley will not make more power. You simply cannot escape the fact that a properly designed 2-1 will give you more useable torque where you need it, in the 2000 to 4000 rpm range, which means less downshifts and less rpm to get the job done. A set of short staggered duals at peak rpm can be made to produce good power but they will be dead on their ass until they get there, whereas an engine developed around an LSR 2-1 exhaust can be made to perform from the bottom up with no dips in the torque band!

Baffling Alien Discs and Aluminum Butt Plugs

Our testing has shown that the Harley V-Twin is extremely sensitive to back pressure which is why 2-1's that use small or restrictive collectors don't breathe well, and why restrictive baffles shut the motor down. Disc type baffles are good for spark arrestors on dirt bikes but they have no place on a big inch V-Twin. You don't make power by adding restrictions to your exhaust system whether it's a bunch of stainless discs or some damn piece of aluminum billet machined into a Harley butt plug! Ever wonder why they had to put a hole up the center of the discs? Well, one reason was the discs are so damn restrictive you have to have several pounds of them to get enough flow through their waffle shaped passages.

Good mufflers, but they have nothing to do with performance and they sure as hell do not create vacuum as has been claimed. When you get confused by all the bullshit simply ask the following question.." Do they run them in NASCAR or in Formula One?". Nope, they run straight pipe collector systems without any stupid discs or aluminum butt plugs.It's always funny how when the money is on the line, all the little things like discs, billet caps, anti-reversion flaps, reverse megaphones and other such nonsense somehow don't make the field.

Anything else isn't "Pro", just prophylactic

If you look at any other "pro" or "king" self-proclaimed winners of the typewriter wars, take a close look ar their collectors and their tail sections  On your LSR Pro Stock you get a boost out of the gate when you hit our CNC machined turbo venturi...On the other pipes you either run into a jagged weld or some necked down piece of torky-porky poor engineering.

Headed for the collector on your LSR Pro Stock it high velocity all the way...On the other pipes there are a barage of aluminum butt plugs, stupid discs 90 degrees to your path, and an assortment of flat airfoils and anti-reversion tank traps to slow things down.  Get the picture? This isn't rocket science. Just build a clean system with a gentle smooth flowing collector and the rest will take care of itself.

Pictured above is a TC88 big bore from HD of Lynchburg...138hp. Part Number 00-1127 2" B Style. Street bike that races. Pro Pipes like certain combinations. Contact HD of Lynchburg to find the right combination for yourself.


"Dear friends at RB Racing,

Just installed my new LSR 2-1 Pro Stock pipes on my 120ci Merch with a 6-speed Baker transmission. Haven't had a chance to Dyno Tune yet (the best Dyno guy in town is swamped just before Sturgis). But I can tell you one thing even without having my motor Dyno Tuned it fucking RUNS like a striped ass monkey!

I've had Python-3's, Hooker, Thunderheader, two different types of Vance & Hines and the RB Racing pipes are THE BEST pipes out there! I can't believe the increased horsepower ( and I am sure torque). Without measuring on the Dyno machine yet I am screaming out to 90 mph in seconds. It blows my mind!

And the sound, oh God the sound. My motor is finally breathing like it should and your pipes are the reason why. All the power junkies that ride with me are drooling, they can't believe it either. I can't wait for the Dyno results but right now I am packing for Sturgis. This 120ci mean mother is ready to roll 90+mph from Omaha to Sturgis.

THANKS RB Racing for a tremendous product. You guys know your shit and the dynamics of exhaust theory. Thanks again! Know the rules, bend the rules, think 500 miles ahead.----- Steve "WFO" Kendall "

"The lady I placed my order with asked me to send a picture of my bike once we mounted the exhaust, I told her I would. The finish on the exhaust was flawless. The fit was perfect. The bike sounds better than it has ever sounded and runs better than it has ever run. I couldn't be more satisfied. My brother, who is not easily impressed, was equally impressed. He didn't like the look or the sound of a 2-1 exhaust until he seen and heard your Pro Pipe. Thank you for producing a far superior product, it was well worth the wait. "

Shreveport Chapter


Customer writes: "The pipes arrived Friday. They fit and look great. I will send a better picture when the bike is completed sometime in August. Right now it is painted with Primer for initial assembly. The bracket you sent is also going to work. Can't wait to start it up and see how it performs and sounds. Thanks for getting them here quickly."

00-1050 C Style, 2" LSR 2-1 Pro Stock in Silver Ceramic. TP 121" motor with a 250 rear tire. After painting and detail work here is the finished bike. Pretty hard to make it any leaner or cleaner.

Customer writes: "The craftsmanship and fit of this header far exceeds anything I have seen in this industry. (14 years)". Silver Ceramic 00-1306 Challenge pipe on a rigid.


00-1233 Rubber Mounted Sportster Custom. 1 3/4" primary tubes into merge collector. For more details on Harley Exhaust Technology visit our Tech Page.

Customer writes: "I've done installation of my new RB Racing Pro Stock couple hours ago, and ridden several miles around town. I just Love them. On Wednesday I'll do Dyno and jetting, I guess gonna be Wow. !!! Thanks a lot!!!!"

132HP Sportster

S&S Cases .250" wider than stock with a 100 Inch 4.00" x 4.00" combination. Brach heads and serious horsepower. Pipe clears brake pedal and tucks under master cylinder at a 45 degree angle. Pipe is set up for two oxygen sensors and is about to be sent out for a 2500 degree, dual coat ,semi-gloss, black ceramic finish. We do not sell "raw" systems.

Special order 2" LSR 2-1 Pro Stock 2" Sportster Challenge pipe 00-1306. The bike belongs to Paul of Branch-O"Keefe Co. the famous firm, Branch Flowmetrics, founded by industry legend Jerry Branch. In 1977 Jerry ported the cylinder heads for our 24 Hour Endurance Racing bikes...things come full circle. 132hp.

B and C Styles...Click on photo to enlarge


The "B" style is pictured on the left and the "C" style is pictured on the right. For some applications the LSR 2-1 Pro Stock are only available in one of these configurations. For example, if your bike has floorboards you have to go with the "C" style where the rear pipe turns downward before the nose cone.

00-1126 B Style, mid peg, Dyna TC88 with 1 3/4" primaries in Black Ceramic finish.

Bonneville Proven

 LSR stands for Land Speed Record and that means only one place...The Bonneville Salt Flats, the Great White Dyno. We have the only gas powered street legal bikes over 200 mph and we're damn proud of it. RB Racing doesn't race typewriters, we race motorcycles and when someone says they get a 70% gain from their system, ask them for their 200mph Bonneville Records or any records for that matter. Hell, if we raced typewriters it sure would be a lot easier, not to mention cheaper.

The fact of the matter is 98% of pipe manufacturers never have raced anything.

We place an LSR tag on each exhaust system we make so they can be easily identified. Every now and then over the last twenty plus years someone decides to copy one of our designs, usually because some customer is very happy and he "stirs up the pond". They copy the general look but not the features that make them work. The tags eliminate any question about whether it's an RB Racing design or not and allows people admiring your bike to know the pipe's origin.

The tags have proven to be very popular and have been used since 1992. Every now and then someone asks us to not place the tag on their system to which we answer..."send us an affidavit certifying that you have removed all manufacturer logos from your tires, engraved Performance Machine logos from your brakes, Mikuni or S&S identifications from your castings, Harley identifications from your gas tank, Nike logos from your tennis shoes etc. and we'll consider it". The last guy we let talk us out of this was getting his bike in Hot Bike magazine and said he'd give us "credit" for a one off pipe we designed. When the magazine appeared on the newsstand all we saw was "computer designed pipe by Sands Racing". That was the end of that.

New Cloisonne Tags

Like in the adage "The relentless search for perfection" we have upgraded the logos we put on our LSR Exhaust Systems. Previous tags were stamped and formed aluminum with silkscreened details. The new cloisonne tags are a precision die struck brass, nickel plated, with powdered glass fired in an oven then polished to a jewelry finish. These are direct replacements for our older tags and are available for US $25.00 postpaid via US Global Express (foreign) or Priority Mail (domestic US). They come with black headed rivets and are riveted in place with a light coat of high temperature silicone (Permatex 598B) behind the tag.

Turbo Venturis

All RB Racing LSR Exhaust Systems feature our "new" (we've been quietly doing it since 1985!) CNC machined Turbo Venturis that actually "scavenge" to help your motor breathe. Machined from billet, these allow full 2" flow and eliminate the phony restrictions that other 1 3/4" to 2 1/4" pipes have at your exhaust port.

Pictured above is an LSR 2-1 Pro Stock C style (J) with 2" primary tubes, part number 00-1050. The bike features a Chopper Guys frame with a 121" TP Engineering motor with a 5/8" offset.

Our competitors must think you won't notice that they neck their 1 3/4" to 2 1/4" pipes down to as small as 1 1/2" to mate them to your exhaust ports. RB Racing's Turbo Venturies are expertly heliarced to each primary tube eliminating any internal obstuctions and insuring the maximum flow from each exhaust port. RB Racing won't build phony performance pipes...We sure as hell won't ask you to port your heads, put in bigger valves and a high performance camshaft then stick a bunch of stainless steel discs or machined aluminum butt plugs in the pipe to restrict the flow! And we damn sure won't put some silly "1950ish" reverse megaphone pipe with internal flat plates, baffles and air foils to screw up your performance. Our pipes make anywhere from 6 to 18HP over these stupid designs.

LSR CNC Machined Gaskets Mandatory

Our CNC machined Turbo Venturis are not compatible with the "bowl-shaped" late model OEM exhaust port gaskets and require early style "flat" gaskets for the LSR Exhaust Systems to both fit and seal properly. The narrow machined flat face of the Turbo Venturi must seat against a flat suface, not the bowl-shaped late model gaskets. Using the LSR Exhausts in combination with the wrong gasket will cause misalignment, inability to tighten the provided close tolerance aircraft nuts, and will force the bowl-shaped gasket into the exhaust port. The correct gaskets to use are: Harley OEM 65324-83 or Drag Specialties DS 174742.

Mandatory for a nominal charge of $ 9.95 are a pair of our LSR CNC machined gaskets which mate perfectly with our Turbo Venturis. These are proven in over 16 years of use on our race and turbo applications...the only gaskets that will stay in a turbo bike for 25,000 miles! These gaskets prevent any gasket "creep" into the exhaust flow and are one more thing that will give you "an edge" on the competition.

We always wondered why people would port their heads, put in bigger valves and then squish the gaskets into their exhaust ports. We bet you never paid attention to what was going inside your exhaust ports for one very simple can't see what's going on in there once the pipe is tightened! The LSR CNC machined gaskets also insure perfect alignment of the exhaust system. Most fitment and alignment problems are traced to using either the wrong type of gasket or using old gaskets that have taken a "set". We've always used these on our race applications and it's time everyone who's concerned about performance should do the same.


RB Racing LSR 2-1 exhaust systems use either one or two slip joints depending on the model. We suggest you put a coating of Permatex 598B ULTRA BLACK in the slip joint. None of our slip joints use any clamps because then they wouldn't be slip joints anymore. The inner pipe gets hotter that the outer pipe and they grow into each other and form a tight seal. The 598B is a non hardening gasket material and will prevent any leakage from condensation that forms in the pipe and, with the usual carbon particles, will actually seal better over time. It also makes the pipes easy to take apart later on. Get a tube before you install your RB racing exhaust system.

General LSR 2-1 Installation Sequence

1. Remove the OEM exhaust and exhaust bracketry. If the bike has floorboards remove the right floorboard.

2. Pry the OEM exhaust gaskets out of the exhaust ports. We use billet gaskets instead.

3. Install the frame or transmission bracket provided. Use Blue Loctite on the mounting bolt threads into the transmission. Lockwashers under the bolt heads on the transmission mount. If through-bolt like on early rigid Sportsters or Shovels use lockwashers under the hex nuts.

4. Front and Rear primary tubes: Install billet flanges and clips. Install front pipe loosely with billet gasket and nuts provided. Loosely affix the front heat shield to the pipe as you might not be able to install the shield later with the rear pipe in place. We use 1/4 drive ratchet plus extensions and 3/8" socket and a 3/8" wobble for the exhaust stud nuts.

5. If the rear pipe has a slip joint (rubber mounted C Style) slip the rear pipe into the tail section. You may use Permatex ULTRA BLACK.

6. Begin slip of tail section/rear pipe into the front exhaust slip joint (You may use Permatex ULTRA BLACK) and work the rear exhaust and billet gasket into the exhaust port. Loosely affix exhaust stud nuts provided. We use 1/4 drive ratchet plus extensions and 3/8" socket.

7. Slide 5/16" x 18 bolt(s) into slotted bracket on back of exhaust and thread these through the mounting braket. Loosely affix with lock washer(s) and hex nuts provided. Some exhausts may require a spacer (provided) between the exhast slotted bracket and frame/transmission bracket.

8. Gently tighted up all fasteners and nuts. Nothing can be in tension. You may use a rubber mallet to seat the slip joint(s).

9. Install remaining heat shields and tighten front heat shield (5/16" Nut driver). Completely wipe the pipe and shields down with a clean cloth to prevent grease and oil stains from being baked on.

10. Run bike briefly in place. Let it cool down and retighten fasteners. Reinstall the right floorboard with hardware provided.

11. If ceramic finishes it is wise to go through several heat cycles. On modern efi closed loop systems they go into closed loop within minutes. Let bike idle for a few minutes then shut it down to let it cool. Several sessions of this will cure the resins as they are only oven-fired to 400F. Exhaust temperatures are >1000F.

12. Double check all fasteners and ride the bike. Check your work afterwards. You bought a Harley so you are already showing signs of dementia.


All LSR 2 into 1 exhausts require special close tolerance aircraft nuts to bolt the LSR Turbo Venturis to the exhaust port. Standard 5/16" x 24 hex nuts will not fit. Each exhaust comes with the required four nuts. It is recommended that you order an extra set (4) of these nuts, part number 00-1001, when you order your exhaust.

O-Sensor Ports Standard

All RB Racing LSR exhaust systems come standard with a machined and heliarced oxygen sensor boss just below your front exhaust port. This port is designed to accept and oxygen sensor (18mm x 1.5mm) which will allow you to use our RSR Air/Fuel Ratio Meter to tune and monitor in real-time your air/fuel ratio. Also, if you really wish to get 55mpg and kick ass, our RSR Fuel Injection's closed-loop heated O-Sensor will plug directly into this port.

We supply both 18mm and 12mm O2 ports depending on the application...In the case of late model 12mm we often supply both.

Custom Made for Your Application

Every LSR Exhaust is custom made for your particular application. We can handle offsets for wider frames and even build "taller" pipes for those applications that have cylinders that may be 3/4" or more taller. No wire feed bubble gum welds! All LSR Exhausts are fully heliarced for the cleanest possible appearance. It takes five times longer and is much more expensive but it is the best way to do it.

All motors are not the same size, so we offer all our exhausts in both 1 3/4" and 2" sizes as well as step header 2 1/2" LSR Nitro Duals...We are the only manufacturer to do this! Your new 100+ inch motor shouldn't be choked off with too small a pipe! Pictured above is a Confederate with a 120 Cubic Inch Merch motor with our LSR 2-1 Pro Stock 2" part number 00-1195.

Self-Tuning Myth

People have the idea that closed-loop systems are completely self-tuning and that they are going to sell you some add-on gizmo that will automatically tune your efi bike. This is a crock of shit. The truth is that every engine is different and, in the Harley world, difference is the norm as there are limitless engine build combinations.

In Detroit, Japan, or Germany, they spend thousands of man-hours developing base maps for their automotive applications. On top of these base maps goes the closed-loop feedback mechanism controlled by mathematical equations or algorithms that govern exactly how the closed loop operation will function. These base maps are not written so the vehicle will run perfectly without feedback i.e. maps are not designed for open-loop operation. The strategy for closed-loop operation is different as fuel requirements under different climatic and altitude differences can be as much as 30%. Unless the base map is constructed for the particular application, the O2 feedback mechanism will not work properly.

OEM correction schemes allow only very slight learning corrections or they will "throw" an error code. They do this for a very specific reason i.e. if things are going wrong, which is indicated by the system trying to correct out of bounds problems, then a sensor or something else is wrong. They are not designed to make large swings to correct calibrations that are way out of bounds.

Beyond Stupid

Some add-on boxes for late model O2 sensor equipped oem Harleys eliminate the O2 sensors altogether. Why in the hell would you want to take a self-adjusting, sophisticated system and turn it into a gas guzzling low mileage dumb efi system? Beats the hell out of us and, since we make closed loop efi systems, we do have some experience in this area.

You bike should be left in closed loop, tuned in closed loop and monitored with O2 displays in closed loop. Correction factors defined in the oem code cannot be exceeded. Maps have to be rewritten for the changes to the bike so thje base map is in agreement with the oem algorithms.

Phone Sex and Remote Tuning

In some sort of logical disconnect a few customers call us up wanting us to tune their bike over the phone and then become increasingly indignant when we tell them it just doesn't work that way. Now, we spent the better part of 14 years, starting in 1976 working on carburetors, jetting, needle design, and even designed and marketed a flat slide carb for the Harley market. Thousands of man hours representing about 5 months out of every year were devoted to jetting issues.

It got to be a real issue i.e. it was an interesting experience to define what the correct air fuel ratios should be, experimentally figure out how to measure them, and then deal with tuning die cast critters, often modifying them with extra circuits etc. but, in the end, it was temporal and an endless loop that did not exactly pay the bills.

We did learn how to make things run well, not that anyone appreciated it. It was fun to watch people try to beat you when they couldn't. Knowledge. Hard work.

For the last 20+ years we were working on and manufacturing closed loop fuel injections systems for Harley Davidsons and have set numerous Bonneville, El Mirage and Maxton speed records and won drag racing championships with them. We spent over 3000 man hours writing and perfecting Autocal.V6 prediction and analysis software for our RSR Fuel Injection systems. Why did we spend 3000 man hours? Well, we didn't plan on it, and it's a good way to flirt with insanity, but we saw no other option as digital efi requires hundreds of decisions, all of which are intertwined. No more brass jets. Exponential combinations. Changing points, one at a time is sheer insanity. Progress comes with increased complexity.

Guess what..We made EFI simple but people are not simple..and few had any idea what to do even if you got out the silver platter and handed it to them.

These days all Harleys are closed loop fuel injected with a single throat throtttle body and are speed density Delphi systems, all very complex. It's the same formula we decided on 18 years ago. The only thing we suggest is that you use O2 signals to monitor and tune the system as the sensors are a hundred or so millisecond accurate and must be monitored at the exhaust port where temperatures are high and as far away from the outside oxygen rich air as possible.

We suggest you use software, not hardware, to adjust your system using our RSR Air Fuel Ratio Gauges and keep your bike off of the dyno until the lights in these displays tell you your mixture is correct. Engines operate in a very narrow realm of air fuel ratios. If you want to go to the dyno after this...fine.

Just don't call us breathlessly demanding we tune your bike over the phone.

Superflow CycleDyn...Testing a Running Motorcycle

If you are going to use a chassis dyno it has to be a tool and not a toy. At RB Racing we use the Superflow CycleDyn as it best emulates the real world. We use it for development and not for publishing "dyno charts". Most of our work is with Pectel SQ6M controllers which have extensive internal datalogging and playback capabilities up to 2000Hz sampling rates. With the Superflow we can program specific tests and transient sweeps with our turbocharger systems up 750 hp in inertial mode or 500 hp in Eddy Current controlled accelerations.

For those of you who like Dynojet "Dyno Graphs" this article.

Steve Cole (TTS MasterTune) who has spent untold thousands of hours on every dyno imagineable has this to say about CycleDyns:

Steve Cole: "In the development side what I can say is the SuperFlow when setup properly emulates the real world much better. As an example the only way to get a DynoJet to give you HP and TQ is a WOT unloaded run. The SuperFlow allows that plus just about any other combination you like with real torque output. So what does any of it buy you becomes the question. I can tell you that if we tune to a DJ and get the best we can, then repeat on the SuperFlow using real world acceleration rates for the engine being tested the results are very different. Take the final calibrations and run them in both dyno's unloaded and the DJ developed type calibration will show the most HP and TQ in those conditions, on both the SuperFlow in DJ mode and the DJ. Then take the SuperFlow controlled condition calibration and load it in the bike the power will go up when tested in the SuperFlow mode again which can only be done on the SuperFlow.

Now the hooker, take the bike and put one of the finished calibrations in it and give it to the customer and say go ride it and come back after you've ridden it well, to know how it feels/runs. They come back after an hour or so then load the other calibration and ask them to do the same riding over and come back again. Each and everytime we have done this every customer has picked the calibration that was done on the SuperFlow under the controlled acceleration modes! So pick what works for you but there is a difference. Does it take longer, does it end with a measurable difference............. YEP!"

When we have turbo bikes like our Road Glide Turbo it gets a bit interesting to go testing in LA traffic with police, cell phone cameras, and freeway cameras. We still do real world riding with data acquisition as the real world is where you ride.

People want "Dyno Sheets"...see below. We aren't going to test every damn camshaft, compression ratio, piston confguration, cylinder head etc as there is not enough money nor time to do so. However, we do testing for our own race development, R&D, and our personal development platforms.

Dyno Sheets

People call us all the time asking for "Dyno Sheets" and we patiently tell them we do not provide self-serving graphs predicting fantastic horsepower and torque gains. Plenty of customers send us dyno sheets but, as we've been at this a long time, we know the tuning game is too complicated to provide numbers just to sell an exhaust. Tuning is a multi-variable process.

When the EVO motors came out Jerry Branch published his famous manifesto on tuning 80" EVO motors...In short, unless you bumped the compression the horsepower was not forthcoming. Same these days. In 2014 John O'Keefe of Branch O'Keefe ran an extensive series of tests on OEM Twin Cam cylinder heads to see if he could offer a "less expensive" ported head as everyone with a grinder in his garage was suddenly an expert at cylinder head porting. John found out that any attempt to clean up the ports killed the flow and port velocities dropped. He scrapped that idea and kept his well-proven chamber modification, porting and valve replacement system.

Logic seems to be in short supply when it comes to tuning. Tuning is not a pipe changing exercise. The world these days is full of customers who agonize endlessly over what to buy and then dump these parts on some unsuspecting "shop-tuner" expecting miracles. It just isn't going to happen. Coordinated development is expensive and time consuming. If it was NASCAR developer they might spend days searching for a few hp or a different curve for a specific track.

If you are looking for warm cuddily sheets we are clean out of them. We post some that customers provide. We are tuners and you can buy all the trick parts in the world and a guy with a well tuned mild bike with a good power to weight ratio will kick your ass. Real world. Find a good tuner or become one. Look in the mirror.

Torque and Ruby Slippers

People get pissed at us when they ask for "numbers". We always tell them we "don't know" because after nearly 33 years of tuning and racing and designing we have seen too much and done too much to give any placebo answer. In fact it always depends on the bike and the tuner. No two bikes are alike. Maybe your bike was built on a Monday and they left a coke bottle in the gas tank (old Detroit wive's tale)...Some bikes are faster than others. Everyone believes their bike is "faster". It depends on the tuner and, these days, the bikes are more complicated. People change from chain to gear drives. They put on different cylinder heads. They switch cams. They add on tuning twiddle boxes. They tune, or the "shop" tunes. They "dyno" the bike...maybe even somebody rides the bike with instrumentation like our RSR Air Fuel Ratio Gauge.

People call us up then hang up when we tell them we don't know what their "gains" will be. We don't publish self-serving charts. We just take all the experience we have and build the best parts we can. People end up happy who buy the parts because they are well made and are designed to perform. We make different tube diameters and offer a wide range of systems for any particular bike so you will maximize your potential. There is no "One Size Fits All" at RB Racing.

People who don't buy the parts because we won't coddle them with assurances go elsewhere where Aunt Em will tuck them in and tell them what they want to hear.

LSR 2-1 Pro Stock Brackets

Rubber or rigid we have a complete mounting solution for your bike. We see lots of combinations, from stock to offset customs and can provide mounting solutions for most applications. For some pipes like Shovelheads we give you a piece of steel strap and tell you to fake it. On the Shovels there is a slotted bracket heliarced to the back of the pipe that is just outboard of mounting points on the frame...two quick bends and two holes and you're done.

Note: All LSR exhausts require the use of the OEM flanges and circlips. The Harley part numbers for these flanges and clips are: 65328-83 (exhaust ring clamp) and 65325-83A (retaining ring). S&S Cycle SA or B2 (145" Tribute) cylinder heads require four bolt flanges which we provide and are part of the pipe assembly captured by or Special Application Venturies.

FXR: There are FXRs and then there are aftermarket FXRs like Kenny Boyce frames and a variety of "Rubber Mounted" pro street and quasi-Softail designs. For all of these we provide a 1/4" steel plate that bolts to your transmission. The bracket is slotted to allow for variations in engine mounting and has a selection of dowels that take into account the different transmissions available. The bracket attaches directly to the back of the LSR Pro Stock pipe, which has a slotted bracket heliarced to the pipe. The bracket does not interfere with billet aluminum swingarm pivot mounts like those on Kenny Boyce frames or other aftermarket pivot mounts.

FLH/FLT/Road King: Transmission mounted. 1/4" laser cut steel plate dowel mounted. No oem brackets are used. Remove oem brackets.

DYNA (Evo): Transmission mounted. 1/4" laser cut steel plate dowel mounted. No oem brackets are used. Remove oem brackets.

DYNA (TC88): Transmission mounted. 1/4" laser cut steel plate dowel mounted. No oem brackets are used. Remove oem brackets.

Softail (All): Pipe bolts directly to frame via 3" wide heavy steel "Z" bracket. No oem brackets are used. Remove oem brackets.

Evo Sportster: Frame mounted laser cut bracket replaces oem bracket (all rigid mount models). On 2004 and later models we supply a bracket that attaches to the outer cover that supports the mid part of the rear pipe. On 2004 models remove the large oem bracket which requires the removal of the rear final drive cover aft of the transmission. #30 Torx required to unhook rear brake rod. 

Chrome, Silver Ceramic, or Ceramic Black Finishes

Chrome or Ceramic: All chrome is full automotive grade duplex nickel, triple plate; Ceramic Black finishes are a two layer process with an underlying alumina ceramic covered with $200.00 per gallon semi-gloss black. "Black" pipes are fully polished as if they were to be chromed to remove any surface defects, then are blasted, ceramic coated, baked, tumbled, cleaned, shot with black semi-gloss ceramic paint and then baked a second time to complete the process. We've tried everything you can think of and these are the best finishes.

Both ceramic finishes can be polished or have scuff marks removed by using Mother's Aluminum and Magnesium Polish.

Newer Dual Coat Black Ceramic Finishes

We have a lot more people looking for durable ceramic finishes and we think we have the best finishes on the market. In the late 70's and early 80's we tried all sorts of coatings and paints and even used porcelain on some of our products in the late 1980's. The newer ceramic finishes are tougher and we use both Polished Silver, and Semi-Gloss Black to complement our usual chrome offerings. The newest "Turbo" Black finishes are a dual coat process that gives additional protection against scratches and nicks, providing two barriers against corrosion.

In more than three decades we have tried all sorts of black finishes: Kal Gard, VHT, Techline, and others. We also in the mid 1980's we even tried porcelain for awhile. It chipped and the heat distorted the parts. Most finishes will not survive over a long period unless they have a base coat to cushion rock strikes and scratches. The surface has to be perfectly prepared and most applications can fail if run too soon at elevated temperatures as they are typically baked at 450 to 500 deg F whereas the cure takes place at around 750 deg F. Lower temperatures will not cure the resins and they will fail once the bike is run. To get around this dilemma we have found the best solution is a 2500 Deg F Ceramic cushion base coat and a secondary Black Semi-Gloss finish on top of this.

Dual Coat Black Ceramic finishes are therefore the most expensive as they involve a triple process. First the parts are polished to remove any tooling marks.Then the parts are zirconia media blasted to prepare the surface. Then parts are cleaned. The parts are base coated with a 2500 Deg F ceramic and baked. The next day they are sprayed with black ceramic and baked for a third time.


On our Dual Coat Black Ceramic LSR 2-1 Exhaust Systems the heat shields and heat shield clamps are ceramic coated with 2000 Degree F satin black ceramic finishes. These finishes resist carb cleaners and other chemicals. Our Silver Ceramic LSR 2-1s use silver ceramic coated heat shield clamps.

It's the Airflow That Limits Things

RB Racing LSR 2-1 Exhaust systems are available for S&S Cycle Special Application "SA" heads with 2 inch diameter primaries. The standard SA exhaust valve is a whopping 1.75" diameter (B2 heads are 1.800") with a special (non standard) exhaust port configuration. These are the best production castings going with their raised inlet and exhaust ports. Oh, you can fool around with the usual porting bullshit, but you'll end up where these castings start out in terms of cfm. Progress is progress and year to year the only horsepower gains come when you make the cylinder heads more efficient.

The problem with the SA heads is that nothing fits their four bolt pattern and the shallow non-standard pocket is decidedly bigger than anything sitting on the shelf...stock flanges need not apply! S&S figures you are going to fab your own exhaust so they provide a machined spigot that slips through the four bolt flange. The idea is that you get some springs and make up a slip joint and go creative...this doesn't work on street chassis.

Flanges and Turbo Venturies for S&S "SA" B1, B2, B-3 Heads

Compare the oem size exhaust flange on the left that is used on "billet" motors with the "SA" flange on the right...get out your calipers and see what's holding these other motors back. RB Racing is familiar with these four bolt critters as we use them in our 113" RSR Fuel Injected ORCA motors both turbo and normally aspirated.

For our 113 / 126 / 139 ORCA motors we use cnc machined special Turbo Venturis that capture a laser cut four bolt flange and are in turn heliarced to our 2" LSR 2-1 primaries. The Turbo Venturis flow 8 to 12% more than a straight section pipe. Later T143 motors use the two bolt flange.

If you have a set of these "SA Heads" and want a specific exhaust be sure to tell us at the time of your order. Adding an "SA" suffix to a listed part number will do the job. Remember they are only avaiable for LSR 2" primary designs. Pictured above is a silver ceramic coated LSR 2-1 Pro Stock for a 113" ORCA.

S&S 145 Tribute Exhausts Available

We custom make LSR 2-1 Exhausts for the taller 145" S&S Cycle Tribute EVO motors that were designed for DYNA style transmissions (Ness or other frames). Specially machined Turbo Venturies, 2" primary tubes, square four bolt flanges (no gaskets).

If you have a set of these "B2 Heads" and want a specific exhaust be sure to tell us at the time of your order. Adding an "B2" suffix to a listed part number will do the job. Remember they are only available for LSR 2" primary designs. Earlier "SA" heads and the 145" Tribute engines have different exhaust port seat diameters, so be sure you specify which heads you have.