I wouldn't get hung up about "most free flowing" when you have stock cats in your system. It's like trying to run when your congested. Once you slap on an exhaust, that is the single greatest restriction point for air flow (except maybe air filters). Find out what sound you like and go from there.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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