I had a full 3'' system on my 9000... it's an excellent, good value system - nice sound good performance. The tail pipe looks nice on the 9000, but horrible on the ng900.
On my 9-3 I've got the viggen backbox, which is actually the "European Saab sports exhaust"- made by Remus in Germany - thats the thick oval one with the stainless steel trim...
I've heard the " USA Saab Sports Exhaust" (available from dealers and most saab aftermarket people), and with a race cat on there.. it sounds awesome! - thats the more circular looking single tail pipe with 'SAAB' imprinted on it.