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Judging solely by your comment on the GS300 exhaust thread, you just want sound and don't care about perfomance, yeah? Just remove the entire exhaust after the cat and run it open... loud as hell and annoying as anyone could ever wish for. Hell... remove the cat too and just run open header.
My car came with 2 flowmaster 40s. I removed the cats and resonator and replaced them with a welded in section of straight pipe. It sounded like an ls1 camaro. It was gloriously loud. I changed to an x pipe set up with two super 44s. Now its all basso profundo. Kind of a boring sound now