K&N Performance Cold Air Intake Kit 57-2530 with Lifetime Filter for 1999-2003 Ford F250/350 7.3L V8 Power Stroke Diesel Estimated horsepower gain of 14.88 HP at 2925 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 Fits some Ford Excursion, Ford F250 Super Duty, Ford F350 Super Duty, Ford F450 Super Duty, and Ford F550 Super Duty models