Pit Stop USA is The Online Motorsports Superstore! SuperTrapp Industries history of the SuperTrapp muffler begins in the Davis, Calif. garage of inventor Paul Moller. From those humble beginnings, SuperTrapp Industries, Inc. has grown to be a leading manufacturer of aftermarket performance exhaust systems for a variety of motor vehicle applications, including motorcycle, ATV and automotive. The SuperTrapp brand has long been recognized as the performance standard, combining added power with innovative styling, quality, and versatile sound. SuperTrapp's Patented Tuneable Disc Technology is the signature feature of SuperTrapp exhaust systems. The diffuser disc technology, created and patented for the XDUSOR, the first motorcycle exhaust product sold by Moller in 1971. By adding or subtracting discs, the you can tune the powerband and sound of your 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. Most SuperTrapp systems come with installation instructions that indicate the recommended number of discs for each application. We feature SuperTrapp Model 549 S/C Standard Mufflers, SuperTrapp Model 549 Long S/C Standard Mufflers, SuperTrapp Model 544 Disc Only Mufflers, and SuperTrapp Diffuser Disc Packs at low everyday prices!