Setting the standard for power and value, the HMF Performance Series has been track tested with over a decade of championships. The specially designed, unrestricted core provides maximum flow and allows the exhaust to increase horse power and torque evenly throughout the entire power curve. The trademark to the HMF Performance Series is the exhaust's sound. With a deep, aggressive sound, you'll typically see a 2 - 10 dB increase from the stock exhaust system. Powersports full system. Designed for 4-stroke sport quads. 304 stainless steel headers and inlets. T-6061 aerospace-grade aluminum canisters. TIG welded aluminum brackets. Heavy-duty stainless steel rivets. Two-piece billet end caps that accept a U.S.F.S.-approved spark arrestor (included) and the exclusive HMF quick-change low dB Quiet Core (sold separately). Packed with Bristol Core brand pillow packing.