K&N Performance Cold Air Intake Kit 57-2531 with Lifetime Filter for 1994-1997 Ford F250/F350 7.3L V8 Power Stroke Diesel Estimated horsepower gain of 9.77 HP at 3022 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