K&N 57-2533 FIPK Performance Air Intake System Estimated horsepower gain of 5.55 HP at 4721 RPM Designed to improve throttle response and engine sound Lasts up to 100,000 miles before service is required (depending on driving conditions) Replaces entire factory air intake system.Free-flowing high density polyethylene tube Easy to install, usually in 90 minutes or less