K&N Performance Cold Air Intake Kit 57-1542 with Lifetime Filter for Dodge Magnum/Challenger/Charger, Chrysler 300 5.7L/6.1L V8 Estimated horsepower gain of 21.09 HP at 5216 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