K&N has designed a performance air intake system for the 2008 and 2009 Ford F250 (F-250), F350 (F-350), F450 (F-450) and F550 (F-550) Super Duty 6.4L V8 Diesel. K&N dynamometer tests show a 16.4 horsepower gain with use of this K&N air intake modification. K&N tests multiple vehicles for each air intake kit it makes to ensure a consistent horsepower and torque gain. This video demonstrates the steps needed to install a power gaining K&N air intake into a 2008 and 2009 Ford F250 (F-250), F350 (F-350), F450 (F-450) and F550 (F-550) Super Duty 6.4L Diesel. http://www.knfilters.com/search/product.aspx?Prod=57-2576