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FMF Offroad Powercore 4 Exhaust Spark Arrestor For Yamaha | 044021 MemorialDay25 Easy to understand premix ratioFitment: Make Model Year YAMAHA TTR225 99 05 The latest version of the Powercore 4 design incorporates a hi flow core which has more surface area to absorb more sound while flowing more exhaust Constructed with an extruded aluminum canister, a stainless steel midpipe that is MIG TIG welded and has space age internal packing Lighter, stronger and more powerful than stock exhausts Powercore 4 S A has a U. S. Forestry approved maintenance free, stainless