UTV programmer and power package allow your machine to perform at its best Stage 4 kit includes Power Vision with custom tunes, premium clutch kit, stronger silicone charge tube with billet bypass valve and upgraded turbo for maximum power gain and performance Cooler belt temps for longer belt life Optimized back shifting Faster acceleration Adjusts for different terrains and tire sizes. STAGE 4 KIT POL RZR XP TURBO 17-19