All Balls Racing – Chassis Bearings & Hardware for Polaris, including air filters for the 12-14 RZR 4 XP 900, the 11-14 Ranger 4x4 800 EFI, the 01-04 Ranger 2x4, the 2015 Ranger 570 Full Size, the 2020 RZR Turbo Pro XP and the 2020 Ranger 1000, plus thermostats for the 2000 Xpedition 325 and the 12-14 RZR 4 XP 900. These are the intake and cooling service parts a side-by-side burns through fastest, and both jobs get neglected until performance drops off. Filter media and frame dimensions match the factory housing for each model, so the element seats fully and dust cannot bypass the seal, which is what protects rings, cylinder walls and turbo compressor wheels on the Turbo Pro XP. A correct Polaris air filter keeps airflow high enough for full throttle response instead of choking the engine as it loads with dust. A fresh thermostat opens at the designed temperature, so the engine warms fast, stops overheating at low trail speed and holds steady coolant temperature under load. Check the filter after every dusty ride. Tell us your RZR or Ranger model and year and we will confirm the right part before you order.