Hi-Flo end cap boosts all-around performance Computer-designed and dyno-tested for every 4-stroke application Enhanced sonic evacuation delivers a higher flow of exhaust gases, which increases power A stainless steel mid-pipe mates to the computerdesigned rear can for lightweight durability Round perforated steel inner cores make for optimum flow, using hi-flo technology FMFs exclusive cross-weave internal packing provides longevity and maximum sound dispersion Elliptical aluminum can offers strategic sizing for superior performance Optional Quiet Core insert will provide a decrease in sound level if desired Feature a screen-type spark arrestor that does not interrupt exhaust flow or performance