TurboWorks exhaust manifold is made of 100% stainless steel. It has a wastegate output, hole spacing 70x45mm, diameter 38mm. 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 muffler, or to several silencers in series, and then to the exhaust pipe end. The kit includes a set of gaskets. & nbsp