That doesn't make sense to me. You are still improving exhaust flow regardless. I can almost guarantee that a LTH with HFC will outflow testpipes and HFC because it is leaving the headers more efficiently. Granted the difference may be academic, but they will always come out on top.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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