K&N Performance Cold Air Intake Kit 63-1564 with Lifetime Filter for Dodge Challenger/Charger, Chrysler 300 3.6L V6 Estimated horsepower gain of 8.09 HP at 5231 RPM Designed to improve throttle response and engine sound Easy to install, usually in 90 minutes or less Replaces entire factory air intake system Not legal for highway use in states adopting California emission regulations