21-24 CRF450R MLFR P-CORE 4 HEX

Optional Quiet Core insert will provide a decrease in sound level if desired FMF's exclusive cross-weave internal packing provides longevity and maximum sound dispersion Round perforated steel inner cores make for optimum flow, using hi-flo technology A stainless steel mid-pipe mates to the computer-designed rear can for lightweight durability Enhanced sonic evacuation delivers a higher flow of exhaust gases, which increases power Computer-designed and dyno-tested for every 4-stroke application Hi-Flo end cap boosts all-around performance Elliptical aluminum can offers strategic sizing for superior performance Includes removable spark arrestor