Edelbrock 03-07 Silverado/Sierra 4.8L/5.3L/6.0L E-Force Supercharger (No Tune)The Edelbrock supercharger Stage 1 Street system part #15770 for 2003 06 Silverado and Sierra 1500 and 2007 Sierra Classic increases the performance of your 6. 0L Gen III engine to 364 horsepower and 397 ft lbs of torque at the rear wheels, when used with Edelbrock tune (kit supplied without a programmer). The Edelbrock #15770 Supercharger also works with the 4. 8L & 5. 3L Gen III engines, HP & Torque numbers will vary. The core of this system is the