Powercore 4 Slip-On MufflerHi-Flo end cap boosts all-around performanceComputer-designed and dyno-tested for every 4-stroke applicationEnhanced sonic evacuation delivers a higher flow of exhaust gases, which increases powerA stainless steel mid-pipe mates to the computer-designed rear can for lightweight durabilityRound perforated steel inner cores make for optimum flow, using hi-flo technologyFMF's exclusive cross-weave internal packing provides longevity and maximum sound dispersionElliptical aluminum can offers strategic sizing for superior performance Optional Quiet Core insert will provide a decrease in sound level if desiredIncludes removable spark arrestor