LSR Nitro Duals

Radical Stepped (Tapered) Header Design Flows 12 to 20% More Than Any Other Duals - Full 2" CNC Machined Turbo Venturies at Ports Taper to 2 1/2" Large Diameter Tailpipes  

Note: we no longer make these. They were originally dersigned for Nitro Burning Pro Dragsters and are really too large for street bikes. Our LSR 2-1 Designs are much better performers. WE offer 5 ranges of LSR 2-1 designs from quiet Black Hole designs to full race Pro Stock systems..

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.

New SS Titanium Finish

In our continuing effort to offer you the best product we have a new SS Titanium finish that we have been testing for a year. We now have four finishes to choose from: Chrome, Silver Ceramic, Black Ceramic, and SS Titanium Ceramic.

Chrome is a no-brainer. It's a shiny, reflective, hard surface that can be covered by heat shields and is resistant to scratching. Black is the finish when you want black...It's that simple. Silver Ceramic is a popular coating that is well known to be durable and to hold the heat in the pipe.

The new SS Titanium finish is a dark semi-gloss metallic grey that will not show dirt, stains, or marks as easily as do the other ceramic finishes. It is the lowest maintenance of the "coatings". Sportster Pro Stock Challenge shown.

06' Dual O2 Sensor Systems / RSR Air Fuel Gauges

Since we have been doing closed loop fuel injection systems for Harleys for more than 15 years and have been putting O-Sensor Ports in our exhausts for the same amount of time, we have dual O2 ports for the 06 models for our full range of exhausts. Our RSR Air Fuel Ratio Gauge is the best investment you can make for these.

All LSR Nitro Dual exhausts can be ordered with two O2 ports. Actually O2 sensors are a really neat item. We should know, as we have a lot of experience with them. Tuning strategies are different and there are a lot of things that can go awry if you forget about temperatures, pressures etc.

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.

LSR Nitro Duals - Not Your Phony Piggily Wiggily Pipe!

 No phony piggily-wiggily pipes! These are a true stepped header design that increases you pipe's diameter from 2" to 2 1/2" in the first eight inches of each primary just like the top fuel racers do. All LSR Nitro Duals feature CNC machined Turbo Venturis that actually extract gases from your combustion chamber. If duals are your style and you've got to have the best looking, best performing design...THESE ARE THE PIPES! No anti-reversion bullshit, no phony necked-down, choked-off design that is only good for parking and talking. There simply isn't a better way to make a set of high performance duals.

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 engines that use phony piggily wiggily pipes that are necked down at the exhaust port 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.

Race Proven - Dyno Proven

On a professional flowbench these pipes, when flowed through a carb / manifold / head / cylinder / exhaust setup will outflow any staggered dual on the market and with the exclusive Turbo Venturies will even outflow a straight section of pipe! Even on a small motor like a full race high compression Sportster drag bike they show a four hp gain over any other design. Drag race E.T.s typically drop two to three tenths when LSR Nitro Duals are substituted over other dual "drag pipes". Professional engine builders who specialize in big inch motors like Johnson's High Performance, Yadkinville, N.C., simply love Nitro Duals. Give Mike a call at Johnson's High Performance if you need a special motor for your bike: (336) 679-8006; FAX (336) 679-6210. He knows what works.

In case you are wondering about how long these pipes are...Well they sure aren't "Long Johns" that are stretched out to the end of your bike. We are not going to make stupid bullshit pipes that don't work. LSR Nitro Duals are, when measured through their centerline are about 37 1/2" long which has proven to be the optimum length for power. Check out our movie on the LSR Nitro Duals by clicking on the image above or by going to out Cinema page.

Click on photos to enlarge

_____Evo Big Twin Nitro Duals__________Evo Sportster Nitro Duals___________Pro Stock (Kick Out) Nitro Duals


Removeable Baffles

Our standard LSR Nitro Duals have bolt-in removeable baffles to knock the edge off their deep rumble and to provide a bit of back pressure for low end response. The slight back pressure prevents blow down during the overlap of the inlet and exhaust valves.

LSR Pro Stock Nitro Duals are a "kick-out" design and do not have any baffles. The Pro Stock design is intended for actual Nitro-Burning drag bikes but works well on larger high compression 100+ inch engines.

Absolute Show Stoppers - Click on photo to enlarge


All LSR Nitro Duals are truly hand-made with exquisite heliarc welds and become the focus of attention on even a carved-from-billet custom bike. The tapered head pipes draw everyone's attention as they aren't the usual phony-baloney fat pipe...And they sound downright mean for a simple reason...Because they actually work! You snap the throttle and they go! Not the flat sounding blat! blat!blat! you get from the mile-long phony fat pipes. Available in chrome or ceramic black these are serious pieces of equipment for serious bikes. And don't forget that all LSR Nitro Duals have an O-Sensor port on the front cylinder for the RSR Air/Fuel Ratio Gauge or for the RSR Closed Loop Fuel Injection heated O-Sensor.

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.

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 $20.00 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.

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 Venturis 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.


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. 96" Softail 00-1078 in Black Ceramic pictured.

LSR CNC Machined Gaskets Optional

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.

Optional 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.

O-Sensor Port 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.

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 itis 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 are a set of our LSR Nitro Duals on a 2000 Fatboy.

Mounting Brackets

LSR Nitro Duals are made to fit about everything...but sometimes as they say in the big city "You're on your own!". Here's a brief run down on our mount systems for the Nitro Duals:

FXR: OEM (factory) FXRs: Front pipe mounts to a special plate that is bolted to the transmission. Rear pipe is attached to the front pipe with a tubular support that runs underneath the front pipe. Front and rear pipes are locked together with double bolted brackets. Midway between the front and rear pipes the support bar is attached to a 5/16" thick steel plate with an integral rubber Lord Mount that bolts to the swingarm pivot.

On Pro Stock (kickout) Nitro Duals the rear pipe attaches to the Lord Mount on the 5/16" thick steel plate that is bolted to the swingarm.

Aftermarket FXR frames often do not use the oem steel pivot, so it is up to the customer to adapt the pieces we provide for their particular application.

Softails (All Models): A tubular support bar bolts directly to the chassis. This support bar in turn has two bolt brackets which attach the front and rear pipes. A different bracket is required is required for the LSR Pro Stock (kickout) Nitro Duals but it works the same way.

Dyna (Evo & TC88): A 5/16" steel plate bolts to the transmission which, in turn, supports a tubular brace that attaches to the front and rear pipes. Two bolt tabs attach front and rear pipes to this tubular support.

FLH/FLT/Road King: Front pipe mounts to a special plate that is bolted to the transmission. Rear pipe is attached to the front pipe with a tubular support that runs underneath the front pipe. Front and rear pipes are locked together with double bolted brackets. Midway between the front and rear pipes the support bar is attached to a 5/16" thick steel plate with an integral rubber Lord Mount that bolts to the swingarm pivot.

Evo Sportsters: The front pipe has an integral bracket and bolts directly to the engine/footpeg/master cylinder location. The rear pipe bolts to the factory support bracket with a tab supplied by RB Racing.

Chrome or Black Finish

Chrome or Black: All chrome is full automotive grade duplex nickel, triple plate; Black finishes are a two layer process with an underlying alumina ceramic covered with $200.00 per gallon satin 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 satin and then baked a second time to complete the process. We've tried everything you can think of and these are the best finishes.

Now Available for S&S Special Application "SA" Heads

RB Racing LSR Nitro Dual Exhaust systems are now available for S&S Cycle Special Application "SA" heads with 2 inch tapering to 2 1/2" diameter primaries. The standard SA exhaust valve is a whopping 1.75" diameter 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.

RB Racing is familiar with these animals as we use them in our 113" RSR Fuel Injected ORCA motors both turbo and normally aspirated. For our 113" ORCA motors we machine special Turbo Venturis that capture a laser cut four bolt flange and is in turn heliarced to our LSR primary tubes. These Turbo Venturis flow 8 to 12% more than a straight section pipe. We also make LSR 2-1's for these heads for those of you who prefer a 2-1 design.

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.

S&S 145 Tribute Exhausts Available

We custom make LSR Nitro Dual Exhausts for the taller 145" S&S Cycle Tribute motors that are designed for DYNA style transmissions (Ness or other frames). Specially machined Turbo Venturis, 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.