full Exhaust

[97Trans_AM]

what would it cost me to get a full exhaust system, not cheap one but not one thats going to brake the bank. and how much more power will that give me

[BlackLT1Z28]

Obviously, price depends on what you want. Shorty headers, mids, or longtubes into true-duals, or into a y-pipe, then a catback.
Headers can cost anywhere from $300- $1000, y-pipe from $125-$250 and a catback $400-$800. And of course true-duals, TSP has a bolt-on kit for $400, or you could try to fab up your own. Dumping the TD's before the axle would probably be cheaper than taking it all the way back.

As far as power, with a tune, depending on setup, you could see anywhere from 15-40hp increase.

PS - Go with longtubes whatever you do. And stay away from flowmaster.
www.ls1sounds.com for clips of different setups.