EPI MUDDER CLUTCH KIT 28-29.5 TIRES POLARIS RZR 4/S 800 4x4 2010-2011 Designed for mud riding with aggressive lug tires Helps restore power loss due to addition of mud tires Better low end power and torque to get tires turning in the mud Quicker backshift which results in crisp throttle response Reduced belt slip and clutch heat