Designed specifically for extreme performance, the Polaris ProStar® 1000 H.O. engine features 110 horses of High Output power and all of the hallmark ProStar® features. This includes dual overhead cams, electronic fuel injection, and 4 valves per cylinder. It also features light weight design with massive dual bore 48MM throttle bodies and long-tip fuel injectors giving the RZR XP 1000 instant throttle response and quick to rev characteristics