Borg Warner EFR Turbine Housing V Band 3.5" downpipe flange. This the exact size flange needed for all the Borg Waner EFR series turbochargers. This is machined from a forged piece of billet 304 stainless material for strength, will not warp as easy as other flanges that are cast then machined. This is a special flange we developed to allow you to either run a 3" downpipe(mated to inside of flange), or a 3.5" downpipe welded to outside of flange.
The side that faces the EFR turbine housing does not have the semi interlocking stepped style flange. We do not sell this type of flange as we've found it does not work very well.
-Machined from Forged Billet 304 Stainless Steel
-Billet material resists warping when welding
-Able to weld 3.5" or 3" downpipe.