The GSL package added power windows, disc brakes at all 4 corners, and a limite slip differential. The car is a very good car when treated well, very few problems, and tons of smiles per mile. The car is so much fun to drive, very controlled, if you have ever driven an Rx-7, you know. This car does have a few problems, but mechanically, it is the most sound out of any Rx-7 I have ever seen, and I have owned 4 Rx-7s, and seen MANY of them.
Here is a quick summary.
The patron control system is quirky, and I still haven't tried a judgment of it yet. I asked whether this was a ton, but was told it was normal.