The ALL-NEW! 144HP Polaris ProStar® Turbo engine, with integrated turbocharger is specifically built to take extreme performance to a new level. The ProStar Turbo is the most powerful side-by-side engine available from the factory on a stock vehicle for unequalled power, torque, durability and excitement. The new engine includes a huge number of improvements, including forged pistons, an upgraded 270 degree firing order crankshaft, high strength connecting rods, closed deck cylinder, sodium filled exhaust valves and new oil system. To control the massive power delivered by the ProStar Turbo, the engine management system has also been updated to include knock detection, boost control and a high flow return style fuel system ensuring that the engine delivers maximum power under all conditions, altitudes and temperatures.