7m gteu?
 

I have a mk3 7mgteu supra how do I tell if its rare or not?

If you are thinking Turbo-A, It would have to be a 1988, black paint and wheels, larger than normal air filter box and air intake to the turbo among other things. Here is a link to wikicars.
Photos can be found online.

http://wikicars.org/en/Toyota_7M_engine#7M-GTEU