In my years of research on here and working on these cars, I have in my head that EA82s have a VF-7 and EA81s have a VF-4 then early Leggys get a VF-11. If that is wrong we can end the discussion. It is also my understanding that the EA81T VF-4 was oil-cooled only.
Well, I pulled the turbo from my 88 RX. The unit is clearly marked as VF-4, and it is water-cooled. I'm pretty sure that it is the same turbo that came in the RX with ~120k miles. The previous owner had it for a couple years and thought that it was an original motor. It could be from a different EA82, or maybe bonus junk from another car purchase, but I'm pretty sure it was my first one and daily driver.
Could it be a rebuilt VF-7 with a VF-4 compressor housing (where the marking are)? One of my motors is one of the JDM imports, could it be a JDM-only legit water-cooled VF-4?