The MX2 carbon fiber silencer was designed with race performance in mind. The MX2 is lighter and sleeker than stock silencers, and is purpose-built to perform, as well as give you that classic 2-stroke sound. Lightweight carbon fiber housing. 304 stainless steel mid-pipe (where necessary). Long lasting glass packing. Riveted, reinforced 6061 CNC mounting brackets. Can be used with either a Bill's Pipes or stock head pipe (except where noted). Hand-crafted in the U.S.A.