I would look at the member FS threads for deals on exhaust components. People here change their exhausts like they do underwear. There is a midpipe back 5Zigen exhaust for $400 floating around, some short tails, and other inexpensive options for quality parts. You will get the extra volume you want, spent little money and get no CEL.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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