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The cars are identical mechanically. 88-92 all the same. It is possible the that used motor that you bought was just in better shape and that it was taken care of better than your old one. I dont know if you were the original owner of your 90 but if not maybe the original owner did not take good care of it. Maybe he did not do the proper brake in when the car was new. There are a thousand factors that could make on GT faster or slower than the next. Even with the same driver. This is not unusual. Take a look at all the different times that different magazines have for cars even if they test the same modol car a few months later.

I guess just consider yourself lucky that you have the faster one now. Just think how you would feel if the second one was slow. That would suck.
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