EPI Sport Utility Clutch Kit, Stock Motor 27"-28" Tires, 0-3000' Elevation - Fits: Polaris RANGER RZR S 900 2015 Designed to improve low and mid-range acceleration for all trail riding. More efficient in transferring the power of your ATV/UTV down to the tires. Helps to decrease belt slippage, which will decrease clutch heat. Designed for stock motor and stock exhaust.