The MX2 Silencer was designed with two things in mind: performance and weight savings. The MX2 is lighter and sleeker than most stock silencers, and is purpose built to perform and provide you with that classic crisp 2-stroke sound. 304 stainless steel mid-pipe and end cap. Long lasting glass packing. Reinforced mounting brackets. Can be used with either a Bill's Pipes or stock head pipe (expansion chamber). Hand-crafted in the U.S.A.