SuperNano-Web Dry Air Filter: The Injen SuperNano-Web Dry air filter is included with the EVO1501 cold air intake. 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, which 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 reliable fit. , , Hassle-Free Installation: Keep it simple! Every Injen Evolution Cold Air intake that uses our Twist-Lock System has been strategically designed to utilize fewer parts and tools to provide the end user with one of the swiftest and most manageable installations available on the market today., , Dyno Proven: Plain and simple, NUMBERS talk! Injen has a strong legacy of designing and thoroughly testing every product we develop and the EVO1501 clearly benefits from our dedication to performance. Our engineers put in countless hours of testing to prove that we have developed the safest, highest performing kit on the market. With 13 additional horsepower and 12 Ft.-lbs.of torque, Injen is proud to say that the EVO1501 Evolution Cold Air Intake system is the very best intake system for your Civic Si that money can buy.