A catback exhaust will help(mine dyno'd at 7whp/20ftlbs of tq), and if you want to go for more, a downpipe and then wait for the BMS stage 2 tune. You will be knocking on the door of 300whp and approach the high 12's at 106+mph.
'98 Dinan/RMS stage 2+(VAC cams, CES Cutring etc)
'11 Saab 9-3 XWD tuned(wife)
'06 Saab 9-5 Combi 5mt tuned(Aero interior/Konis etc)