2004-2008 Ford F-150 - K&N Cold Air Intake - Generation II K&N 57-2556

"K&N 57 SERIES GENERATION II FIPK COLD AIR INTAKE SYSTEM -- Provides Additional Power Up To 15.47 hp At 3829 RPM, 96%-99% Filtration Efficiency Rate, It Significantly Reduces Intake Restriction As It Smoothens And Straightens Air Flow, This Allows The Vehicle's Engine To Inhale A Large Volume Of Air Than OEM Air Filter Assembly For More Usable Power And Acceleration Throughout The RPM Range, C.A.R.B. Certified, Street Legal In All 50 US States, Comes With A Washable And Reusable Filter, Heat Shield Included, Easy Installation, With K&N's Limited Million Mile Warranty"