HMF Racing Yamaha YFZ 450- Performance-Series Slip On 04-13The Yamaha YFZ 450 is available as a Slip On or Full System in the Performance and Competition exhausts. The Competition Full Exhaust picked up roughly 6 more horse power and 4lbs of torque. The Performance Series is available in manufacturers colors, and Competition exhaust includes 3 removable inserts to adjust power and sound levels according to your riding area. Fits: (04 13) YFZ 450, SET, W, SPX FUEL TUNING IS REQUIREDLEARN MORE Fuel Tuning is