The Edelbrock E-Force Supercharger Stage 1 Street system part # 1578 for 2007-13 Silverado and Sierra 1500 increases the performance of your 5.3L Gen IV engine to 364 horsepower and 397 ft/lbs. of torque at the rear wheels. With the 4.8L Gen IV engine expect an increase to 334 horsepower and 380 ft/lbs. of torque at the rear wheels. The core of this system is the Eaton Gen VI 2300 TVS Supercharger rotating assembly with a four lobe design with 160 degrees of twist for maximum flow, minimum temperature rise and quiet operation for excellent drivability. We also designed our superchargers with an integrated bypass valve to help eliminate parasitic loss under light throttle, improving mileage potential. Our unique and efficient inlet configuration results in a shorter, less restrictive intake path for improved air flow, without the need for a jack-shaft. Keeping the air cool is a high capacity air to water intercooler and low temp heat exchanger. The Edelbrock #1578 system is emissions legal and provide the best combination for your daily driver. The supplied tune is intended for completely stock vehicles with the exception of a cat-back exhaust. This kit will include a tune for 91 octane fuels.