If it's just low down running that is rough then again, I would say unlikely that the headers would have a bearing on this whether they are standard or otherwise. Standard headers have that very restrictive squashed X where they join as a kind of collector which can also mislead into thinking there is a problem as often one can will be hotter than the other to touch.
Just to confirm-I know you have checked through the alternator and RR wiring but has the battery also been replaced?
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