AA Water Cooled Big Turbo w/Pro XP Housing for RZR XP Turbo & Turbo STurbo fits 2016 2021 RZR XP Turbo & Turbo S Models New for October 2022: Our proven turbo now uses larger AR housings like the Pro XP turbo for even more flow and less back pressure. We went to the larger housings after testing and finding with the correct tune adjustments this turbo can spool just as fast as our standard water cooled turbo offered for years. The biggest difference from our previous turbo is the reduced exhaust backpressure (even