Edelbrock E-Force Supercharger Systems for 2003-13 GM trucks and SUVs are designed to produce more torque and horsepower for each application. You'll feel the boost in horsepower throughout the entire RPM curve! Towing and off-road vehicles will see tremendous benefits from the 12" intake runners that increase low-end torque. When installing one of these Supercharger Systems on a brand-new truck, you'll have peace of mind with Edelbrock's 5-Year/100,000-Mile Supplemental Warranty (systems without tuners are not eligible for this warranty). Supercharger systems sold with tuners are emissions legal. Supercharger systems sold without tuners are only emissions legal when used with the correct Edelbrock tune.