Hey, I have a '96 900SE. Looking up stuff, it's actually a pretty good start. Plans for my car are highflow intercooler, highflow downpipe and cat. Remapped ECU and new springs to start.
There are a couple of sites online that specialize in performance parts for Saabs that have all this stuff. All I have right now is a Saab sport exhaust. Sounds really nice and unlocked 5 or 6 HP. Anyway, if anyone else here is into Saabs, let me know, I'm still learning a lot about my car.