Machined steel 4.62" flange (S400 flat V) for your S400 turbo. Most Borg Warner S400 T4 turbine housings utilize this style exhaust outlet flange. It has a machined recess to accept a 4" pipe. Key Features: Compatible with: S400 4.62 Turbo Outlet Flange, Cummins, Duramax, Exhaust, Powerstroke, Universal