a couple of things. first i got just an aluminized system for my catless back. i would only insist and be willing to pay for stainless if i was driving it in the winter and planned on keeping it for a long time. second, here are my spintech sound clips
http://www.ls1gto.com/forums/showthread.php?t=97626
it screams at WOT.
i'd get LTs first. they change the sound and volume quite a bit by themselves and then decide if you want more or a different sound. Get them coated or get SLPs which are already coated. coating will cost ~$250. it will keep the engine bay much cooler and give you more power in the summer. then go get it tuned. you'll gain 25-30 HP with LTs and a tune. The exhaust is mainly a sound thing and will net little power on a mostly stock motor
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