Wanting more POWER out of your RZR XP 900? We have combined our Performance Slip-On Muffler and a Clutch Kit to optimize the performance of the XP 900 by delivering an additional 4.2 horsepower. The Performance Slip-on Muffler delivers well over double the airflow compared to stock. It is constructed of stainless steel for strength and durability. Finally, a Complete Clutch Kit that ensures maximum horsepower transfer to the ground and can be tailored to match your combination and driving conditions.