3" Crankshaft Pulley for M10 - Aluminum - Racing

Racing/Performance. Our 3" billet aluminum crank pulley slows down the alternator and water pump by 45%, which frees up horsepower. These are machined to accept a crank fire trigger wheel (picture with red engine shows crank fire wheel installed). Note: We do not recommend the 3" pulley for street cars. (the 4" pulley is better-suited for street use).