The exhaust manifold by TurboWorks, is made of 100% stainless steel. When tuning the engine, the exhaust manifold should be replaced at the very beginning, because the exhaust gases extruded from the cylinder go to the exhaust manifold, which is part of the engine body, then they are directed to the first section of the exhaust pipe, then to the silencer, or several serially arranged silencers and then to the outlet part of the exhaust pipe. The kit includes a set of gaskets. We provide a 24-month warranty for the product. We also offer lambda probe adapters that eliminate errors There are also additional accessories available for the exhaust manifolds: Lambda probe adapters Thermal tapes Copper-plated nuts TurboWorks exhaust manifold is made of 100% stainless steel. you from the cylinder, they go to the exhaust manifold, which is part of the engine body, then they are directed to the first section of the exhaust pipe, then to the muffler, or several silencers arranged in series, and then to the outlet part of the exhaust pipe. The set includes a set of gaskets. we provide a 24-month warranty for the product.