it probably wouldn't hurt to replace the cat with a new high flow one. that would be the first step i think. you can either get a single in/out cat, or a single in/dual out cat. or use a crossflow muffler, like those found on firebirds/camaros, which will have the look of duals, and will sound better, especially if you use a chambered muffler like a flowmaster. and using the single in/out cat with a crossflow would be cheaper also
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