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. Flange bolt spacing: 74x40mm 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: & nbsp