Computer design assures your electrical and cooling systems run properly while your engine runs easier and their deep grooves eliminate belt throwing. CNC machined from solid billet aircraft-grade materials with a maintenance-free black or clear polished powder coat finish. Power and Amp Series Pullies are designed for vehicles with high amperage needs. Excellent for towing and heavy stop and go driving. Increases horsepower by reducing accessory drag. Typical 11HP at the rear wheels.