TurboWorks exhaust manifold is made of 100% stainless steel. Flange: T3 Wastegate hole spacing: 69x45mm Inner diameter wasteegate: 38mm muffler, or several silencers arranged in series and then to the outlet part of the exhaust pipe. The kit 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 exhaust manifolds are also available. accessories: Lambda probe adapters Thermal tapes Copper-plated nuts TurboWorks exhaust manifold is made of 100% stainless steel. Flange: T3 Wastegate hole spacing: 69x45mm Inner diameter wasteegate: 38mm muffler, or several silencers arranged in series and then to the outlet part 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.