K&N Performance Cold Air Intake Kit 63-1563 with Lifetime Filter for Jeep Grand Cherokee, Dodge Durango 5.7L V8 Hemi Estimated horsepower gain of 17 HP at 4944 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