This one piece, stainless steel, cast exhaust manifold is more durable and holds heat in better than cast iron manifolds. Cast using the same stainless steel alloy as High Tech's stainless steel turbochargers, these manifolds will not crack and leak like welded headers and cast iron manifolds. Because of stainless steel’s superior energy conservation properties they will also spool your turbo faster than stock! Available in both T-3 and T-4 footprints to fit a variety of turbo sizes. Drilled and tapped for a 1/8" or 1/4" pyrometer. Comes with all necessary mounting bolts and gaskets. 6.7L requires aftermarket turbo and programming. 3 year best in industry warranty. FREE Shipping!