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   UPR #9583-01 Pulley, Supercharger, Billet Aluminum, Black Anodized, Serpentine, Steel Hub, 2.80 in. Diameter, 3.00 in. Diameter, Ford, Mustang, Cobra, 4.6L, Kit.  U01-958301   Description:Make pulley changes a breeze with UPR's quick change eaton supercharger pulley kit for your 2003-2004 Ford Mustang Cobra. The UPR kit comes with both 2.80" and 3.00" billet pulleys and billet steel hub. Simply replace your stock supercharger pulley with the billet steel hub and mount either pulley to the hub. Requires the use of a pulley puller tool to remove existing pulley that is not included.Features:*Comes with both 2.80" and 3.00" pulleys*CNC Machined Billet Aluminum pulley and Billet Steel hub*Hub presses on to stock Eaton and pulleys bolt to hub in minutes*The use of either pulley will require a new tune*3.00" pulley will add approximately 3-4lbs of boost over stock*2.80" pulley will add approximately 5-6lbs of boost over stock*Black Hard Coat Anodized Finish Pulleys and Zinc Coated Hub