FMF is about moving forward...faster. The all new PowerCore 2.1 silencer is proof FMF is totally committed to 2-stroke progression. FMF loves 2-strokes, they ride 2-strokes, and they are devoted to delivering superior power to the 2-stroke faithful. -Race-tested, smooth power curve throughout the RPM range. -Engineered to assault today's tracks and trails -Larger diameter canister for more tunability and longer lasting packing life. -Delivers a crisp, notable sound. -Lighter than stock. -Optimally designed to complement performance of FMF pipes; works and fits FMF or stock.