K&N Performance Cold Air Intake Kit 57-1543 with Lifetime Filter for 2005-2010 Dodge Charger/Magnum, Chrysler 300 3.5L V6 Estimated horsepower gain of 11.68 HP at 6215 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