K&N Performance Cold Air Intake Kit 57-1533 with Lifetime Filter for 2003-2008 Dodge Ram 5.7L V8 Hemi Estimated horsepower gain of 10.48 HP at 5445 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