yeah i first had a thread with the same question.,.turned out to be very helpful. do a search you'll find heaps.
my n/a got ......extractors, hi flo cat, 2.5inch piping, 1 resonator, cannon on the end. Sounds ne and tuff and doesnt drone all that much except at certain revs when it holds. otherwise i can barely hear it, unless i step on it. I got my setup done at dandy exhausts if your in south eastern suburbs of melbourne. goodluck