K&N 57-1553 Performance Air Intake Kit for Jeep Wrangler JK 3.8L V6 2007 - 2011 Estimated horsepower gain of 8.17 HP at 4807 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