VMP Performance supercharger pulleys help twist your blower just a bit faster for increased boost pressures and horsepower. Swapping the supercharger pulley is a very popular upgrade for new Mustangs equipped with superchargers because it can be accomplished in your driveway in less than an hour. Some of these pulleys may require additional tuning, use of race fuel, injector and fuel pump upgrades. Be sure to 'View Details' for any additional information.