It's not the charger. Granted, GTM's is better and easier to install, but it's not the charger. It was running fine prior to the header install, so it seems. My best guess is that the tune was too agressive in terms of AFR and the header leaned it out to a dangerous level at WOT. It's really the fault of whoever told the owner that he didn't need a tune, but the owner is also at fault for not knowing that a tune would be needed.
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K&N // GTM // BERK
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