2005-06 GTO headers. All tubes are CNC mandrel bent for optimal flow. Made from 304 stainless steel for maximum corrosion resistance. Starting with a CNC cut 3/8" thick flanges into 1-3/4" diameter primaries, 3" slip-fit collectors with merge spike, then fitting into Includes 3" pipes to connect to factory 2 bolt flange. Catted lead pipes. The best ground clearance and fit available. Headers are fully TIG welded and back purged. Mill finish, These, are TIG welded for strength and durability. These kits come with a lifetime warranty and proudly made in the USA.