Untap Hidden Horsepower. Your accessories can drain horsepower when you need it most. But thanks to this underdrive pulley kit, you can gain from 10-15 horsepower without sacrificing any of your A/C or charging characteristics.
Premium Quality. Don't settle for inferior parts. These premium quality pulleys are made from lightweight aluminum for durability and performance. Made using precise, state-of-the-art CNC manufacturing, you can count on these pulleys to perform at the highest level.
Easy Installation. This Mustang Underdrive Pulley kit installs quickly and easily in under 2 hours with no modifications required.
Application. These underdrive pulleys are for the 1996 to Mid 2001 GT with a long water pump (bowed out face).
Technical Note. Midway through the production run for the 2001 model year Ford changed the design of the water pump on the 4.6L engine. The older style pump produced from 1996 to mid 2001 had a longer shaft. In January of 2001 the design of the pump was changed to a shorter shaft. This necessitated a change in the design of the pump pulley.
Click here to see pictures of the different pulley styles.