Ford Mustang 2005-10 Headers - Stainless steel headers with lead-pipes to connect to factory exhaust system. (Headers with X-Pipe have 2-1/2" leads, while non-x-pipe have 3" leads.) 3/8" thick flanges and smooth flow collectors. Our Mustang headers offer the best fit, ground clearance, construction and performance available! 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!