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Free Up Horsepower. A set of SR Performance Underdrive Pulleys reduce parasitic drivetrain loss by cutting down the amount of power your accessories take up, these underdrive pulleys will free up 10+ horsepower, without sacrificing cooling and charging functionality of your Pony.Premium Quality Construction. CNC-machined from lightweight aircraft grade quality aluminum alloy for strength and durability, these SR Performance pulleys feature a gloss black powder coated finish for aggressive good looks and long lasting corrosion resistance.Easy Installation. These SR Performance Mustang Underdrive Pulleys installs quickly and easily in under 2 hours with no modifications required.Application. This SR Performance 3-Piece Black Aluminum Underdrive Pulley Kit is designed for use on 1986 to 1993 Mustangs equipped with the iconic push rod 5.0L V8 engine, including the LX 5.0, GT and SVT Cobra models. Reuses stock belt.