You shouldn't have issues with HFC's at all. To keep it easy, if you get an Invidia exhaust, why not get the HFC's too? The difference between two HFC's from reputable manufacturers is going to be academic. Just stick with good companies and stay away from knock off's
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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