its saabs "state of the art"., now replaced by the trionic 8, computer program for the car. The Trionic 7 was first used in 1999 in the Viggen and the Aero. The rest of the cars were Trionic 5 still. In 2000 all they cars switched to Trionic 7. Today the 9-3 SS uses the Trionic 8, and im not sure but i think the 9-5's use T7 still. Anyway the T7 uses a Mass Airflor Sensor which makes most of the aftermarket parts different such as air intake, and Blow off Valves. The T7 also has two oxygen sensors in the exhaust so you need a catylitic converter. The T7 can also affectivly limit the power of the engine.....it somehow measures torque and limits the Viggen to 230 claimed hp. The viggen really puts down close to 220 whp, which is almost 250 hp. thats besides the point....the viggen is still limited and the engine will create differnent max boosts to make the desired "230 hp". Generally the thinner or hotter the air gets, the higher the boost is set.
Actually any car built in 96 and after, received 2 O2 sensors. This was in order to become OBD 2 ( On Board Diagnostic) compliant. O2 Sensor simulaters are available. But I am not sure what would work on a Saab. This would help if you decide to ditch the Catylitic converter. I have a 95 so no sensor mods were needed.