Developed through hours of dyno and track testing, this full system is the optimum exhaust system for the YFZ450X and YFZ450R. Hard-anodized oval aluminum muffler shell. Cone-style end cap, Completely rebuildable, Uses stock heat shield, Uses Spark Arrestor (GYT-5XD93-23-SS), sold separately. Meets AMA®/ ATVA® 99bBA requirements. Used by the Yamaha Racing Team including 2009 ITP® QuadCross® Champion Dustin Nelson.

Fits '10~'11 YFZ450X and '09~'13 YFZ450R models

*This accessory is restricted to closed-course competition only. (All '06 and later Sport ATV models are regulated by the EPA, Because this accessory affects emissions, using it constitutes illegal tampering punishable by law unless the vehicle is only used in closed-course competition.