Fitment For Ford Expedition 5.4L 2005-2006 For Ford F-150 5.4L 2005-2007 For Ford F-250 Super Duty 5.4L 2005-2007 For Ford F-350 Super Duty 5.4L 2005-2007 For Ford Lobo 5.4L 2005-2007 For Lincoln Mark LT 5.4L 2006-2007 For Lincoln Navigator 5.4L 2005-2006 products description Brand new 100% Factory tested Superior quality Precision parts Ready to use, Direct Replacement Built to strict quality control standards Function: It forms a mixture In the intake manifold to improve the fuel efficiency of the engine .