Borg Warner turbo
Well borg warners t4 turbos are a t4 bolt flange, but the divided chambers are t3 size. So I'd have to bore them out to t4 size if I went with a t4 divided manifold. They even recommend boring it out on their site when used with a t4 manifold.
Why do that when you can just get a T3 4bolt turbine housing .70a/r from Full-race for about $214...


