ATP cast iron manifold designed for T3 or T3/T4 turbo applications. Specially engineered to fit all VW 8v motors, including crossflow and non-crossflow heads. Hi-temp cast iron prevents cracking under severe heat. Precisely drilled for head studs and threaded (8mm x 1.25") for easy installation of turbo. *Designed for integral wastegate setup but can be modified for external wastegate for $50. Please choose external wastegate option when purchasing.