Vibrant Performance's Volkswagen 2.5L 5 cylinder offered from 2005+ Exhaust Manifold Flange will save you the time and high cost of getting header flanges cut when you need to fabricate a custom header or turbo manifold. This flange is cut from 3/8'' (9.525mm) thick Mild Steel. The port sizing on these exhaust header flanges is optimized for use with Schedule 10 or Schedule 40 pipe.