exaturbo

Hi peoples im new to this forum.
i just got hold of an 84 exa turbo off a mate. I was just wondering what are these usually worth and can anybody tell me anything about it. Its in a pretty shitty condition but i will respray it and re-do some of the interior and maybe some engine work. So far im loving the car it goes faster than any 4 cylinder ive ever driven and is currently on 9psi. The only modifications it has so far is a tacho and shift light, boost gauge, monza BOV, new spark plug leads and an autotechnica cannon muffler. I have kicker splits and an MTX roadthunder amp to throw in her as soon as i get a head unit and also scored an intercooler off a r33 gts-t and plumback r32 gts-t BOV from a mate.
Is it worth doing it up or should i get rid of it? Reason i am asking is that it was recently yellow stickered, so it is definately in need of a bit of restoration to get it back on the road. I have got almost all the rust out of it so the body is fairly straight just with a few dents.
Thanks in advance for any advice or information.
exaturbo