Our gasket is made with a Multi Layer Steel construction, similar to the OEM gasket. We feature a durable stainless fire ring design to promote sealing against the flange surface. Keeping your exhaust gases inside the manifold, right were they need to be. Specs: .65 mm Thickness Layers: 2 Layers OEM Part Number: 44616AA220 Specs: .5 mm Thickness Layers: 2 LayersTurboXS FA20 Turbo to Downpipe Outlet Gasket