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. Bolt spacing for turbo: 72x40mm Exhaust outlet: 50x40mm WG bolt spacing: 70mm WG hole: 35mm Diameter of windows in the flange: 38mm 12 months warranty issued by TurboWorks Polska - an exclusive distributor for Poland We also offer lambda probe adapters that eliminate errors There are also additional accessories available for the exhaust manifolds: Lambda probe adapters Thermal tapes The exhaust manifold by TurboWorks is made of 100% cast iron. precisely to the exhaust manifold, which is part of the engine body, they are then directed to the first section of the exhaust pipe, then to the muffler, or several silencers in series, and then to the exhaust portion of the exhaust pipe. Bolt spacing for turbo: 72x40mm Exhaust outlet: 50x40mm WG bolt spacing: 70mm WG hole: 35mm Diameter of windows in the flange: 38mm 12 months warranty issued by TurboWorks Polska - an exclusive distributor for Poland.