Stainless Works 2015-16 Mustang GT Headers 1-7/8in Primaries 3in High-Flow Cats Factory ConnectionBrand Stainless Works Part Number M15HCAT Category Exhaust, Mufflers & Tips Headers & Manifolds Condition Brand New Original Manufacturer Packaging 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
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