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Honestly i don't know for sure, i would say the intake. I installed the catback the day before Thanksgiving, the intake yesterday and the overpipe today. It was fine for the whole 9 days with the catback, the intake threw it off yesterday and i think the overpipe really did my old tune in today. Since everything was done in 10 days i didn't want to bother him with new files for each part when i knew i had other stuff on the way.
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