2015-20 Mustang GT headers with 1-7/8" primary tubes, 3" diameter catted lead pipes that mate to the factory connection point. Tig welded 304 stainless steel headers with 3/8" thick flanges and 3" diameter slip fit collectors with merge spikes.This system replaces the factory manifolds, catalytic converters with a superior performing lifetime guaranteed bolt-on system.. 2015-20 Mustang GT headers with 1-7/8" primary tubes, 3" diameter catted lead pipes that fit the factory connection point. Tig welded 304 stainless steel headers with 3/8" thick flanges and 3" slip fit collectors with merge spikes.. Stainless Works 2015-16 Mustang GT Headers 1-7/8in Primaries 3in High-Flow Cats Factory Connection. Stainless Works, Ford Mustang Headers, Mustang headers, Mustang 5.0L headers, mustang headers. Stainless Works Headers 1-7/8" With Catted Leads Factory Connect. Stainless Works Ford Mustang Catted Headers.. Stainless Works 2015-20 Mustang Catted. 2015 thru 2020 Ford Mustang GT 5.0L. Exhaust Header Pipe Kit. Exhaust System. Header Kit

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