K&N 63-9030 AirCharger Performance Air Intake System Estimated horsepower gain of 11.94 HP at 4785 RPM Designed to improve throttle response and engine sound Easy to install, usually in 90 minutes or less Replaces entire factory air intake system.Air Filter Height	9 inches (229 mm). Air Filter Large End Diameter	7.5 inches (191 mm) Not legal for highway use in states adopting California emission regulations