Thread: Underdrive Pulley: Useless?
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Old 12-17-2014, 01:58 AM   #3 (permalink)
Trips
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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.
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