Improve acceleration and add style to your motor with 94-04 Mustang underdrive pulleys from 5.0 Resto. Underdrive pulleys increase horsepower by reducing the amount of power required to drive external engine accessories. Choose from popular brands like Steeda, BBK, and ASP for the perfect kit for you. Pick up a new Professional Products harmonic balancer for the perfect accessory drive setup! These underdrive pulley kits fit 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, and 2004 Mustangs with 3.8L, 5.0L and 4.6 L motors.