K&N Performance Cold Air Intake Kit 57-3057 with Lifetime Filter for 2005-2007 Chevrolet Silverado, GMC Sierra 6.6L V8 Duramax Diesel Estimated horsepower gain of 22.09 HP at 2860 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