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i have LS7 manifold, cats and h-pipe, should bolt right up to your GS. I'll do $500-525 shipped (shipping is almost 200 from texas to fl for example). PM me if interested. I can get them in the mail tonight.
forgot to mention...Ls3's claim around 30rwhp for bolting on LS7 manifolds, cats, h-pipe. If you decide not to go with the GS ones again, imho you can't beat that price for 30HP.