4” external disc exhausts for Evolution models. Racey look with slightly upswept muffler.
These parts are not sufficiently homologated for the use within the purview of German road traffic laws. Therefore, use within Germany is only possible on the race-track, for show and exhibition purposes or for restoration of veteran vehicles. Which parts are legal for veteran-restoration, depends on the respective assembly group and the vehicle's age and must be seen about with the autorities in charge.Outside of Germany, the homologation and a possible use in road traffic must be seen about with the local authorities in charge.
These exhaust-systems have less back pressure than the stock system. This causes a lean fuel mixture, the fuel metering system should be readjusted.
- fits Sportster 1986-2003
- Ø 4" external discs
- not homologated
SuperTrapp Disc System
A signature feature of SuperTrapp exhaust systems is the diffuser disc technology, created and patented for the XDUSOR, the first motorcycle exhaust product sold by Paul Moller in 1971.This technology allows the rider to adapt their bike, or ATV, to a specific riding environment. This is accomplished through a series of discs with a precisely aligned diameter that form the exhaust outlet. By adding or subtracting discs, the rider can tune the powerband and sound of their machine in just a few minutes with basic hand tools.
- Removing discs decreases the exhaust opening and increases backpressure. This effectively decreases the powerband to create more low-end torque. It also decreases exhaust tone and enriches carburetion.
- Adding discs increases the exhaust outlet and decreases back pressure. This widens the powerband at the top end. It also increases exhaust tone and leans out carburetion.
SuperTrapp 4” Standard End Caps
CPV End Cap for 4” SuperTrapp
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