I'm not trying to be presumptuous, but I doubt the turbo has been upgraded, even though you were told it was, as the factory downpipe is also in place. I doubt the original owner would hang on to an original downpipe and not the turbo, while changing it all back to stock. When I save parts, I save the mos worthwhile ones. I guess it's possible the original was sold, but being that you have a WRX, and not an STi, I would say it's safe to bet you don't have a VF52 of a VF39. I'd say that looks identical to my TD04, but that's not easy to confirm with the heat shield in the way.