The exhaust manifold by TurboWorks, is made of 100% stainless steel. Guaranteed power increase up to 10%. Outlet diameter (internal) - 48mm Dimensions of the flange outlet window - 32x46mm When tuning the engine, the exhaust manifold should be replaced at the very beginning, because the exhaust gases, extruded 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 silencer, or several silencers arranged in series, and then to the outlet part of the exhaust pipe. We provide a 24-month warranty for the product. We also offer lambda probe adapters that eliminate the catalyst error. Additional accessories are also available for exhaust manifolds: & nbsp