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240Z has your solution, and I'll add that, in order of increased power and cost, downpipes go like this: 2-1/2 split, 2-1/2 super-split, 3" expansion. If you need cats for emissions, you don't need pre-cats (they are replaced by the downpipes). What you may need are the cats, which you can buy used on this site, or you can spend money and buy high-flow cats.
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