K&N 63-9037 AirCharger Performance Air Intake System Clamps Included:5 ; Couplers Included : 2 Estimated horsepower gain of 8.65 HP at 5100 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