A Few Questions

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ok i go a few questions which am sure is right here on the forum but i have been reading and cannot find the answers so please bare with me for these are just the main things i want to know. 1990-1993 mr2 looks the same to me from outside, is there anything different about them? ecu? engine? interior? turbo? anything upgraded or different?? 1994-1996 i realized that the rear changed a bit with lights,spoiler and so on, but the question above applies the same for this what else is