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The Kooks Custom Headers for the GT500 are Mandrel Bent out of T-304 Stainless Steel and welded with one thing in mind.."Precision" The Shelby GT500 Headers are also made with 1-3/4" Primaries which all flow into a 3" Merge Collector then flow into a 3" X-Pipe with High Performance-High Flow Cats Testing with these headers yielded 38rwhp and 40lbs of Tq with the Catted X-Pipe Version. Not only do these headers add performance but the sound of your Shelby will be turned into what it should be. A deep muscle car sound is what you can expect from these bad boys!! The Kooks header kit comes complete with all necessary hardware and 02 extensions!