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ASP Underdrive 25% Crank Pulley with Full Charge at 950 RPM (Hard Coat Black Alum) - 94-98 Ford Mustang V6 3.8

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ASP Underdrive 25% Crank Pulley with Full Charge at 950 RPM (Hard Coat Black Alum) - 94-98 Ford Mustang V6 3.8close

What do Underdrive Pulleys do? Underdrive pulley systems increase engine horsepower by reducing the amount of power required to drive external engine accessories. For example, the alternator, power steering, water pump and air compressor rob horsepower from the engine. By replacing factory-sized crank and accessory drive pulleys with a resized pulley, the accessories are slowed, resulting in more ..