The header pipes help collect gasses and remove them from your exhaust system, with little to no obstacles you are able to have consistent airflow of hot gasses moving away from the engine. Installing the header will help your cylinders as it pushes you exhaust to the exhaust system. Pair your headers and mid-pipes with other accessories like the F150 4.6L tuners and monitors or F150 leveling kit. Check out our F150 5.4L Intakes and tuners for max performance gains. Ford F-150 Fitments: 2009, 2010 Ford F150 with 4.6L or 5.4L engines. Submodel Fitments: FX2, FX4, King Ranch, Lariat, Limited, Platinum, STX, XL, XLT. Some Exceptions apply, please see individual product pages for specific fitments.