TurboWorks exhaust manifold is made of 100% cast iron. 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, and then to the muffler, or several serially arranged mufflers and then to the exhaust end. Dimensions on the sketch in the gallery. 12 months warranty issued by TurboWorks Polska - the exclusive distributor for Poland. We also offer lambda probe adapters that eliminate the catalyst error. Additional accessories are also available for exhaust manifolds: Lambda probe adapters Thermal tapes Copper nuts The exhaust manifold by TurboWorks, is made of 100% cast iron. 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, and then to the silencer, or several serially arranged silencers and then to the outlet part of the exhaust pipe. Dimensions on the sketch in the gallery. 12 months warranty issued by TurboWorks Polska - the exclusive distributor for Poland.