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

You can adjust the opening RPM by changing different thrust springs

Owners must destroy any existing emissions label installed by the manufacturer

The stock XP800 muffler weighs just shy of 16 lbs

Oil Sleeve Category_Default Category/SLED/Yamaha/Sidewinder We extensively tested this mufflerThe 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