SuperTrapp exhaust systems pack more Horsepower with less weight. Provides both wave and outlet antireversionary tuning capabilities, that boost the power over the entire RPM range. The unique SuperTrapp pipe design features an adjustable 4" disc system at the end. Adding discs increases the size of the exhaust opening and reduces the back pressure. Lowering the number of discs used, reduces the exhaust gas outlet and decreases the noise. The ability to easily remove or add discs enables the rider to wave tune the system for maximum power from "Within legal noise standard" to the "Roaring Thunder" of a Drag Racer. These exhaust systems are available in Stainless Steel in either a brushed satin "racers look" or a highly polished finish. For Sportster models there is also a chrome plated mild steel version available. Exhausts bolt to the stock mounting points. SuperTrapp claims, if the carburetor is properly re-jetted, an increase of 10 Horsepower over the stock system. SuperTrapp exhaust systems are recommended by almost every high-performance engine builder and are used exclusively by the factory racing team. Available in complete sets or in header pipes only.