For Honda Civic Si Aluminum Air Intake System (7.0"H Radiation Opening Blue Filter) - FD FG FK FN FA Made of high quality T-6061 aluminum material for strength and durability Lightweight high air flow racing performance spec. design Helps engine to draw in more and colder air resulting in better throttle response and higher explosive horsepower output 2-Layer Washable and Reusable material. Improves up to 95% filtration efficiency Increases 5 to 10 horsepower, 6 to 8 precent of torque, and improve the gas mileage