i think it would be SQR cause you have a downpipe. I think that nick taileferro and engstrom both use speedparts for stages 1 and 2 then for 3 and for i think they use SQR. once you get the downpipe, it becomes stage 3. I may be wrong so someone please correct me if i am.
2000 Saab 9-3 Viggen Sedan
-BSR Cat-Back and Intake