The ECS / ASP 10 % Underdrive Pulley Kit increases engine horsepower by reducing the amount of power required to drive external engine accessories. The alternator, power steering, water pump and air compressor together reduce engine horsepower. The ASP Kit also reduces the rotating inertia on the front of the crankshaft allowing for faster revving. By replacing factory-sized crank and accessory drive pulleys with a this resized pulley, the accessories are slowed, resulting in more horsepower available to the drive wheels. All pulleys are manufactured from billet steel and aluminum, much improved quality and construction over OEM pulleys.
