Mustang Underdrive Pulleys: Frequently Asked Questions

  1. Benefits of Underdrive Pulleys?

    Underdrive pulleys usually are a performance enhancing item that increases the torque and horsepower output of an engine by reducing drag caused by belt-driven accessories. Horsepower gains from underdrive pulleys alone are usually around 4-7 hp. These are some of the best HP improvements enthusiasts can find for their money.