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March Performance Pulleys are precision machined to run perfectly true. This aluminum pulley is CNC machined from 6061-T6 billet for extra strength and wear. Hand polished and finished with "No Polishing" clear powdercoat. The Performance Series increase horsepower by reducing accessory drag. They eliminate belt throwing and are designed for normal street driving. Expect as much as an 12.5 HP increase at the rear wheels! This single piece kit includes an aluminum underdrive crank pulley.