3" stainless steel O2 housing/turbo discharge module. Version 2.0 with 1.75" wastegate return port and Tial 44mm flanged dump tube. Designed to bolt directly to the GT V-band housing on GT3071R/GT30R/GT35R turbos with longer necks. Assumes the use of the ATP cast turbo manifold and 44mm wastegate bolted to the manifold using adapter P/N ATP-FLS-039. Customers using 38mm can bolt the wastegate directly to the ATP cast manifold and build a simple 90 degree dump tube flanged for 38mm to connect to this O2 housing. This is the same kit used on the version 2.0 of our SRT-4 kit utilizing the larger Tial 44mm wastegate.