K&N Performance Cold Air Intake Kit 63-2582 with Lifetime Filter for Ford F250/F350/F450/F550 Super Duty 6.7L V8 Power Stroke Diesel Estimated horsepower gain of 11.92 HP at 2700 RPM Designed to improve throttle response and engine sound Easy to install, usually in 90 minutes or less Replaces entire factory air intake system Not legal for highway use in states adopting California emission regulations