Under Drive Pulleys
Engineered not only to be the best pulley kits on the market, but to provide the best compromise between performance and reliability for your BMW! Specifically, we have designed them to underdrive the water pump, power steering pump and alternator*. These kits provide 10%-20% overall reduction in driving your car's systems and have been dyno tested to provide up to 12hp gain!

*Alternator pulleys - we offer two kits, one for the performance minded individual and one for the serious audiophile. If you have a significant additional load on the alternator from aftermarket audio amplifiers, you will not want to underdrive the alternator. Thus, we simply lighten that pulley rather then underdrive it.

BMW Underdrive Engine Pulleys

Agency Power Underdrive Crank Pulley Kit V10 BMW M5 M6 E60 E63
Code: AP-E60M5-130
Price: $290.00
Quantity in Basket: none
Agency Power Lightweight Crank Pulley Kit BMW M3 E46 '01-'05
Code: AP-E46M3-130
Price: $179.99
Quantity in Basket: none