Has the special "contoured" flare (Borg Warner also calls it 4.21" 3/4 Marmon) to mate to the bevel unique to the only the Borg Warner outlet flange on all these Turbo models. Fab Pros 4" Marmon Flange for the Turbine Exit (Downpipe side) on all the T4 flanged 200 and 300 Series Turbos, S, SX, and SX-E with the beveled face.
