Empire Industries Polaris RZR XP Turbo exhaust with electronic/vacuum valve side dump. Go from quiet recreation riding where the Exhaust flows through the muffler, to race mode at the touch of a button. When the button is pushed it opens the valve and allows the exhaust to escape without flowing through the muffler. This gives you more power and an extremely aggressive sound. Comes with all the necessary hardware to install including rocker switch.