You can adjust the opening RPM by changing different thrust springs

Our billet head kits utilize an improved squish band

We extensively tested this muffler to ensure the best combination of power

Won't crack or blow out like the factory charge tube

Quantity: Sold as a pair (2 rollers)

Oil Sleeve Category_Default Category/SLED/Yamaha/Sidewinder You can adjust the openingThe Oil Sleeve is designed to stop oil from leaking out of the oil cap due to a warped reservoir neck. The Oil Sleeve installs easily into place. Slight heating of the reservoir neck with a heat gun may be required to install the Oil Sleeve. Fits: Ski Doo XP, Rev, ZX, CK, F and S chassis; Arctic Cat Crossfire, M Series and Sno Pro Chassis; Polaris Edge, IQ, RMK, SKS, Switchback, Rush, Indy, Fusion, Evolved and Aggressive Chassis. DOES NOT FIT: MATRYX