2005-10 Mustang GT All tubes are CNC mandrel bent for optimal flow. Made from 304 stainless steel for maximum corrosion resistance. Starting off with 2-1/2″ off-road x-pipe with head-pipes to factory manifolds. These head-pipes and x-pipe join the factory manifolds to the factory connection point with a better product with an easy bolt on installation. These are TIG welded for strength and durability. These kits come with a lifetime warranty and proudly made in the USA.