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All you do is turn off the AFM valves in the FSCM controller via HPtuners and you won't get the CEL for the valves being removed from the exhaust. It costs 50.00 to license the FSCM and I don't believe it trips the flash counter on the ECU(don't quote me) for those that are worried about warranty.
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2016 NFG SS A8/Whipple 2.9/Fuel System/Flex Fuel |