Exhaust manifold designed for: BMW E30 320i 323i 325i 325ix TURBO 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 manifold. exhaust pipe, which is part of the engine body, is then directed to the first section of the exhaust pipe, then to the muffler, or several silencers arranged in series and then to the exhaust part of the exhaust pipe. The kit includes a set of gaskets. The product comes with a 24-month warranty. We also offer lambda probe adapters that eliminate the catalyst error. Additional accessories are also available for exhaust manifolds: & nbsp