Short version of story:
Been yellow stickered. They don't believe this is the stock turbo. Have to prove it, otherwise have to have emissions test.
So, here's the pictures. The car is a 1989 cefiro. Still has rb20 in it. I'm pretty sure the stock turbo is the T28, but I can't find any markings on the turbo to prove it. Apparently the huge amounts of rust isn't enough proof of its authenticity. I can read two of the markings. One has X19A on it, and the other has 2IU. No idea what they mean though.
anything I should be looking for to prove that it's the stock turbo?