K&N High Performance Air Intake System 57 3105 K&N 57 3023 1 KN Performance Intake Kit TrailBuilt Off Road K&N Performance Intake Kit 1988 1991 Honda Civic CRX (57 3503) Performance Air Intake System K&N 57 3031 1 KN Performance Intake Kit TrailBuilt Off Road. 1988 1991 Honda Civic Performance Air Intake System by K&N The K&N 57 3503 FIPK air intake system replaces the restrictive factory air filter and air intake housing in some Honda Civic and CRX models. K&N intakes are designed to dramatically reduce intake restriction as they smooth and straighten air flow. This allows your engine to inhale a larger amount of air than the factory air filter assembly. More air means more usable power and acceleration throughout the engine's RPM range. The 57 3503 air intake comes with a chrome topped K&N high flow air filter with a screw thread to install it into the previous air box space. Air is directed through an aerodynamically engineered intake tube into the engine's throttle body for a guaranteed power gain. The oversized tapered cylinder shaped air filter can be used for up to 100,000 miles before servicing is needed depending on driving conditions. This air intake is relatively easy to install usually in 90 minutes or less using existing factory mounting points requiring commonly available tools to do the job. Features HP Gain: Up to 4 hp Series: 57 Series FIPK Generation I Filter Shape: Round Filter Color: Red Filter Height: 7. 5" Tube Finish: Black System Type: Cold Air Intakes Material: High Density Polyethylene Air Filter Material: Cotton Gauze Replacement Filter: RF 1007 Filter Large End Diameter: 5. 375" Benefits Guaranteed to increase horsepower Designed to improve throttle response and engine sound Replaces entire factory air intake system Easy to install, usually in 90 minutes or less Lasts up to 100,000 miles before service is required (depending on driving conditions) Washable and reusable lifetime air filter Applications 1988 1991 Honda Civic 1988 1991 Honda CRX What's In The Box? 1 Air Intake System 1 Clamp References Installation Instructions Warranty 1,000,000 Miles 10 Year Limited Warranty