K&N Performance Cold Air Intake Kit 57-2546-1 with Lifetime Filter for 2003-2007 ford F250/F350/F450/F550 6.0L V8 Power Stroke Diesel Estimated horsepower gain of 15.53 HP at 3426 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 Easy to install, usually in 90 minutes or less