go to your local exhaust shop
say "g'day mate. how much for a 3-inch mandrel-bent exhaust from the turbo-back? i'm after a cannon muffler on that"
then when you get a price, go to antoher place and ask the same question... also some people might be able to recommend a place where they went and can verify some good quality work
i paid $550 for 3" cat-back in mild steel with large resonator and stainless cannon muffler. the place i went to i think has gone under (blinky's brake and exhausts). i also paid $240 for a 3" dump/front from BATMBL.
you will find that you can get a BRAND NEW exhaust custom-made exactly how you want it for less than the price of a 5 year old jap-brand exhaust that hangs so low that it scrapes along the ground...
cheers,
Warren.