2011-14 Mustang GT headers with 1-7/8" primary tubes, 3" X-Pipe and 3" dia catted lead pipes that mate to the factory connection point. Tig welded 304 SS headers with 3/8" thick flanges and 3" dia slip fit collectors with merge spikes. This system replaces the factory manifolds, catalytic converters and H-Pipe with a superior performing lifetime guaranteed bolt-on system.. 2011-14 Mustang GT headers with 1-7/8" primary tubes, 3" X-Pipe and catted lead pipes that mate to the factory connection point. Tig welded 304 SS headers with 3/8" thick flanges. This system replaces factory manifolds, cats and H-Pipe.. Stainless Works, Ford Mustang Headers, Mustang headers, Mustang 5.0L headers, mustang headers. Stainless Works 2011-14 Mustang GT Headers 1-7/8in Primaries High-Flow Cats 3in X-Pipe. Stainless Works Headers 1-7/8" With Catted Leads Factory Connect. Stainless Works Ford Mustang Catted Headers.. Stainless Works 2011-14 Mustang Catted. 2011 thru 2014 Ford Mustang GT 5.0L. Exhaust Header Pipe Kit. Exhaust System. Header Kit

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