Injen Evolution Air Intake Systems for Diesel Trucks: Injen Evolution Air Intake Systems for Diesel Trucks are Injen's newest product, featuring supernano web DRY filters and massive horsepower and torque gains. The enclosed airbox design offers a clean look and superior heat protection compared to traditional open element systems. Injen Evolution Air Intake System will replace your factory airbox and intake tube. Your existing sensors and hoses will connect to it to ensure a proper fit with no check engine lights. Injen also has taken the guess work out of when it is time to clean your filter with the incorporation of a filter minder gauge. Thanks to the supernano web dry design of the filter, there is no oil to mess with which can cause issues with sensors. With all of these features and the horsepower and torque gains, the choice is simple. The part number for this item is EVO7004 and it fits 2011-2012 Chevy Silverado / GMC Sierra (6.6 LML Duramax Diesel Models). Injen achieved gains of 35hp and 80lbs of torque during their testing!