2011-14 Ford F-150 Ecoboost 3.5L. All tubes are CNC mandrel bent for optimal flow. Made from 304 stainless steel for maximum corrosion resistance. 3" downpipe with catted lead pipes. Includes Y-pipe to fit to factory connection point. These are TIG welded for strength and durability. These kits come with a lifetime warranty and proudly made in the USA.