Edelbrock Supercharger Stage 1 - Street Kit 2007-2013 GM Gmt900 Ls Cp 4 8L 5 3L and 6 0L w/ TunerThe Edelbrock supercharger Stage 1 Street system part #1578 is for 2007 13 Silverado and Sierra 1500 trucks. This supercharger system works with the 4. 8L and 5. 3L Gen III engines and increases the performance of the 4. 8L engine to 334 horsepower and 380 ft lbs of torque at the rear wheels and the 5. 3L engine to 364 horsepower and 397 ft lbs of torque at the rear wheels. The core of this system is the Eaton Gen VI 2300 TVS rotating assembly with a