The Tomei Expreme manifolds are made high quality certified T304 stainless steel and is tig welded for a more precise and perfect finish. What makes this kit unique is that this kit comes with everything seen in the picture for an all-in-one install kit. There is no need to buy extra gaskets, heat tape, or manifold accessories. This kit has it all to simplify installation! Each expreme manifold features an enlarged turbo inlet port to allow better exhaust flow into the turbo.