The gears inside alternators and the water pumps go `round and `round, siphoning off raw engine power with every rotation. Underdrive pulleys put an end to this wasteful horsepower spending, putting lost energy back into your pedal. What's more, underdrive pulleys give your motor a tough new look.
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Unlock the horsepower hidden in your engine with a BBK Underdrive Pulley Set. By working to reduce the speed of your water pump, alternation and crankshaft, they deliver improved horsepower. Custom-fit design bolts on easily. 1-year warranty
Cut your engine drag and crank up the power with an aFe Power Pulley. Custom CNC carved from billet aluminum, this performance underdrive pulley bolts directly in place of your stock auto pulley and delivers up to 10 extra ponies. Comes with belts and bolts. 2-year warranty.