Edelbrock 1577 Stage 1 Supercharger for 2003-2007 Silverado/Sierra 4.8L/5.3L/6.0L W/ TuneEdelbrock Stg 1 Supercharger #1577 03 07 Silverado Sierra 4. 8L 5. 3L 6. 0L W Tune The Edelbrock supercharger Stage 1 Street system part #1577 is for 2003 06 Silverado and Sierra 1500 and 2007 Sierra Classic vehicles. This supercharger system works with the 6. 0L, 4. 8L and 5. 3L Gen III engines and increases the performance of the 6. 0L engine to 348 horsepower and 381 ft lbs at the rear wheels, 4. 8L engine to 339 horsepower and 359 ft lbs of torque