A summary of the changes from 87-93:
Mass air was added to all cars in 89
The front fenders are slightly different in 91 for the new pony wheels
Hypereutetic pistons are used in late 92
There was a slight change in the T-5 somewhere around 90, I think some of the gearsets are a little stronger
89 has gigantic front seat headrests
90 added the airbag and lost the tilt wheel
93 or maybe before, they made the GT interior standard in lx coupes
Mass air was added to all cars in 89
The front fenders are slightly different in 91 for the new pony wheels
Hypereutetic pistons are used in late 92
There was a slight change in the T-5 somewhere around 90, I think some of the gearsets are a little stronger
89 has gigantic front seat headrests
90 added the airbag and lost the tilt wheel
93 or maybe before, they made the GT interior standard in lx coupes