"ATP cast iron VR6 manifold designed for T3, T3/T4 or T04 turbo applications. Will work for both MK3 and MK4 VR6 cars. Hi-temp cast iron 1/4" walls prevent cracking under severe heat. Precisely drilled for head studs and threaded (8mm x 1.25") for both T3 and T04 inlet bolt patterns for versatility and ease of installation. *Cast with external wastegate flange, but can be blocked off with blockoff flange for integral wastegate setups."