The FMF MX / Off-road silencers (made in U.S.A.) are top-performance silencers. Housing made from high-grade, pressed, anodized aluminum. Factory performance characteristics. Hi-Flo exhaust technology. Long service life. Integrated bracket. Dynamically formed stainless steel end caps. Simple fitting. Note: For a perfectly tuned and performance optimized overall system, it is recommended combination with the FMF-pipe. Note: For closed course competition use ONLY.