2016 Polaris Rzr S 1000 Eps Black Pearl, A ProStar engine is an off-road vehicle engine that has been designed, engineered, and manufactured from the ground-up by the experts at Polaris who share the same passion for off-roading as you do. ProStar engines are purpose-built, tuned, and designed specifically for your vehicle and application. By leveraging cutting-edge technology from automotive influences, we have emerged as a trusted leader in off-road powertrain technology.