Exhaust manifold intended for: BMW E46 325i Exhaust manifold by TurboWorks, 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 already at the very beginning, because the exhaust gas extruded from the cylinder goes to the exhaust manifold, which is part of the engine body, then it is directed to the first section of the exhaust pipe, then to the muffler, or several silencers arranged in series and then to the outlet of the exhaust pipe. The set includes a set of gaskets. 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