This throttle body is machined from billet aluminum with a port for your 3rd injector on turbo, or big motor builds. Not only that, but it is taper bored 6mm larger than the stock size throttle body which will improve power on even your slightly modified RZR. Some disassembly of your stock throttle body and assembly of the new one is required. Oversize intake manifold or porting of your stock intake manifold is also required. Does not fit 2011-up models.