2005-10 Mustang GT 1 5/8" headers. Includes (2) 3" high flow converters, 3" lead pipes to connect to Stainless Works cat-back. Tig welded 304 s/s headers with 3/8" thick flanges and smooth flow collectors. Includes (4) 24" long O2 extensions, (2) adapters stubs to fit factory exhaust system, (2) adapter stubs for 3" Stainless Works exhaust system, (8) 3" single band clamps. Combined with our 3" exhaust, and a proper tune, numerous customers have seen gains of over 30 RWHP and 30 RWFT# over stock. As seen in 5.0 Mustang magazine!! Our 2005-10 Mustang headers offer the best fit, ground clearance, and construction available. Don't settle for second best!