This is the 4.21" 3/4 Marmon Outlet V-band flange compatible with these BW (Borg Warner) Turbo models including: Borg Warner S200 S200-SXE S300 S300-SXE S200SX, and many others. 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.
