S13/S14/S15 SR20 TOP MOUNT CAST MANIFOLDCast SR20DET T3 High Mount Manifold with 38mm External Wastegate port, No fear of cracking. It's cast iron, so it'll last forever. Reduce unwanted back pressure from your exhaust system with this top mount turbo manifold for your SR20DET motor. This turbo manifold will allow for exiting gases to be routed more efficiently out of the exhaust system, giving you better engine response and more power.