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One of the easiest ways to free up additional horsepower is to swap out the stock accessory pulleys with a 1979-93 Mustang performance underdrive pulley kit. These 1979-93 Mustang underdrive pulley kits are direct bolt on and available in CNC machined aluminum and black powder coat finishes. Upgrading to a set of Mustang underdrive pulleys can also help increase gas mileage as well as performance.