Yamaha GYT-5TJ93-75-01 Quiet GYTR Performance WR Muffler Insert for Yamaha WR450F
Designed to be used with the stock exhaust system to offer a power increase while allowing your muffler to pass the 96 dBA and 20 inches stationary test. This accessory may be restricted to closed course use only. Fits '05-'12 WR450F.