All the exhaust set ups sounds virtually the same. My dad has a Firebird with 40 series flowmaster and it sounds practically identical to my Magnaflow set up -- a bunched of pissed of bees. My only advise is to stay away from Bassani. Good parts, but has a bit of a raspy/higher pitched bee hive sound.
I'm thinking of getting a Dynomax set up to quiet the cruising noise and to mask the fact my car has no guts.
i had a 95 with true dual 50 series. sounds nothing like the gm 3.8 with a flowmaster which sounds very much like crud. nice low rumble at idle and like an exotic car up higher. not raspy at all.