8-Layer Oiled Cotton Gauze Dry Air Filter: "That?s massive!" is all you will hear about this 8-layer oiled cotton gauze air filter that is included with the EVO7007C cold air intake system. This filter is uniquely designed to work with the Injen Twist-Lock System. Using our Twist-Lock technology has allowed our technicians to use the largest filter available for this application with over 1.25" deep pleats. This giant air filter enhances the air volume resulting in increased power gains while making this installation process quick and easy., , Quality Hardware: From the Stainless Steel Band Clamps with an inner protective liner to the reinforced automotive grade silicone coupler, every aspect is covered for a perfect and secure fit. , , Hassle-Free Installation: Make it easy! By designing this kit in a 3D workspace, you?re ensured a quick and easy installation that not only increases the power output of your engine, but also provides a clean and powerful look that others see every time you pop your hood., , Dyno Proven: Clean and simple, NUMBERS talk! Injen has put in the time and diligence to stand behind our performance data. We put in the time to test and prove that we have developed a superior kit for your GM Duramax L5P. After hours of designing and dyno testing, Injen is proud to say that the EVO7007C Evolution Air Intake system puts down numbers of up to 34 additional horsepower and 76 Ft.-lbs. of torque.