K&N Performance Cold Air Intake Kit 77-9036KP with Lifetime Filter for Toyota Tundra 5.7L V8 Estimated horsepower gain of 7.18 HP at 5490 RPM Designed to improve throttle response and engine sound Easy to install, usually in 90 minutes or less Replaces entire factory air intake system. Lasts up to 100,000 miles before service is required (depending on driving conditions) Free-flowing aluminum tube