ATP cast iron manifold designed for T25 or T3, T3/T4 turbo applications. Will work on any 20v 1.8T motor. Applications include VW Golf/Jetta IV, VW New Beetle, Audi TT, Seat Leon, Audi A3, Audi A4, and Audi S3. Hi-temp cast iron 1/4" walls prevent cracking under severe heat. Precisely drilled for head studs and threaded (8mm x 1.25") for either T25 or T3 inlet bolt patterns.