JET Stage 1 Computer Chip/Module features under drive pulley kits which add horsepower by reducing the drag placed on the engine. This drag comes from having to drive the accessories such as the a/c, power steering and water pump. In an effort to increase the horsepower, the pulleys slow down these accessories to allow the engine to turn with less effort. The JET pulleys have no adverse effect on the operation of the a/c, power steering, charging or cooling systems. The installation is simple and straight forward. It typically adds a 8-20 horsepower and improved acceleration.