NEW! 168HP Prostar® Turbo H.O. Engine: For those who belive that there's never enough, the 168HP Polaris ProStar® Turbo H.O. engine takes extreme performance to a entirely new level. The ProStar® Turbo H.O. is the most powerful RZR® engine available from the factory for unequalled power, torque, durability and off-road excitement.