The Rules have changed

In the early 1980's through the mid 1990's we made thousands of BMW exhausts variously marketed by our distributor as "lifetime" slip-ons, porcelain coated 2-1's, and various sorts of fiberglass baffled parts with silly reverse cone lips. The attitude was "sell them what they want", not what should be made.

What you see here is simply the best BMW R100 Racing exhaust that can be made. Equal length 45mm primaries with a high-velocity merge collector.  The chrome heat shield provides a 6mm insulating air gap above the muffler and there's an additional inch clearance from the saddle bags. Spring retention at the collector and there are anchor points for safety wiring the threaded finned exhaust flanges

The two into one design increases torque and horsepower. The 180 degree opposed Boxer engine wants equal length primaries and the high velocity merge collector does the by the book "tthree-step" into the 2" (52mm) tail section. As the RPM increases the power will not fall off. 

Certain riders who prattle on endlessly about why the 2 into 2 oem design is the ultimate expression of technology (circa 1930) we would like to inform you BMW abandoned this with their twins more than a decade ago. Bye Bye Baby Duals.

People call us up and ask questions like: "How much does the system weigh" and "How much power will I gain". We generally answer these, in order, by responding (1) "How much do you weigh?" and (2) "We have no idea". That doesn't sit too well with some people. Bike goes faster prduces way more torque and you can monitor your mixture in both cylinders with the optional dual AFR gauge. Two 18mm O2 ports are standard.

In case you get the idea we aren't in the business of telling people what they want to hear just to get their money...Well, you'd be right.
It's the best system we can design and as we have over forty years in this game we know a bit about squeezing performance out of a multi-decade old design. FYI power to weight ratio and torque are the numbers you should be concerned with. Put that hamburger down before you call us.

R100RS 2-1 Black Hole Spyder

The exhaust goes under the center of the bike and through the centerstand which means there is no heat by your feet. The merge collector is offset slightly to allow oil drain access. Retention springs are provided for the primary tubes and the pipe mounts to the oem mount on the left side of the bike. Left side exit means the exhaust is compatible with sidecars.

The exhaust comes with dual  oxygen sensor ports for our Dual RSR Air Fuel Ratio meter and Bosch O-Sensors. The meter is suggested as it is the only way to monitor and set your fuel system whether it is Bings or aftermarket carburetors. 

Whatever cards you were dealt we have a better hand. We've been at this for more than 40 years and decided we would build the exhaust that we wanted instead of silly slip on "Lifetime" mufflers and various megaphones and other obsolete stuff. You might want that but we aren't going to build it. The line is drawn in the sand. Surrender and opt for the safety of the past or free your strangled twin of it's old technology and actually get something that works.

We're building a whole new series of Airhead exhausts and this is the first. This one is the "first" because it is what we want...not necessarily what you want. After 40 plus years of this we have learned that it's better to make a good product, sell it to those who appreciate it, and forget about those who pontificate leaning on the fence because they never buy anything anyway.

We are racers and we know what works. You, most likely, aren't a racer, haven't run 200 mph with a BMW and haven't had the desire to outrun things or push a boxer into a 10 second 1/4 mile like we did 25 years ago. For you conservative types who worship the "Blue and White Propeller" we'll have some conservative designs that are safe for you to take out into the world. Heaven help the person who does something different. Guess that's why we are the only people who made 200 mph BMWs and 400 hp Harleys, Black sheep in a white sheep world.

We went out and bought five BMWs to do development on and we've been riding BMWs for over 40 years. We've recently driven them on 1000 mile days averaging 70 mph including stops and in a distant time covered 50,000 miles in Europe on a R75/5. We also ride Harleys and love them. This R100RS is a 1982 model with a lowly 53,000 miles on it that we bought from club racer in Santa Barbara. We bought it because it was stock and not bent up from crashes. It did have a worn out center stand.

We loaned the RS out to a Harley friend of ours who promptly trashed the transmission. Solution: Bought a used tranny off of EBay and put it in without removing the swingarm. Nuts and bolts.

These are just motors and we know a thing or two about motors. There's nothing magical about them and they all have their quirks just like Harleys, Hondas, Kawasakis, Suzukis and Yamahas, not to mention probably 500 other makes that have come and gone. Speaking of quirks, we have to assume the people that designed this bike have size six feet as there in no way for any normal sized foot not to get tangled up with the lower fairing and carburetor short of installing some form of rear sets. We just cut the forgings and moved the location points back 1 1/2". Rearsets suck.

Two wheels and a motor. That's why they are called motorcycles, whether they are festooned with Garmins and heated grips, or ape hangers and leather saddle bags. Just ride.

The R100 Black Hole Spyder Exhaust for the BMW R100. A quiet race system that you can tour or commute with. If you race, it will pass decibel tests. With The Dual RSR Air Fuel Ratio Meter you can be sure you mixture is correct for economy as well as peak performance for each carburetor.

If you order one specify your exhaust port I.D. We are fixtured for both small (38mm) and large (40mm) ports.