Cotton Gauze Oiled Air Filter: , "OMG that's massive!"is all you will hear about this Injen 8-Layer Cotton Gauze Oiled air filter that is included in the EVO5101C. This filter has been uniquely designed to work with the Injen Twist-Lock System. Using our Twist-Lock system has allowed our engineers to use the largest filter possible for this application, which increases the available air volume - resulting in added power while keeping the installation process quick and simple. 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! The Injen Evolution Air intakes that use our Twist-Lock System have been strategically designed to use fewer parts to provide the end user with one of the quickest and simplest installations available on the market today. 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 top-notch kit. So after hours of designing and dyno testing, Injen is proud to say that the EVO5101C Evolution Air Intake system puts down numbers of up to 13 additional horsepower and 13 Ft.-lbs. of torque.