K&N Performance Cold Air Intake Kit 57-2556 with Lifetime Filter for ford Expedition/F150, Lincoln Mark LT 5.4L V8 Estimated horsepower gain of 15.46 HP at 3829 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. Air is directed through an aerodynamically engineered intake tube into the engines throttle body for a guaranteed power gain.Air filter large end diameter-7.5 in (191 mm) Easy to install, usually in 90 minutes or less. Clamp material- stainless steel