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throttle body 78mm tune?

  1. 78MM Big Bore Throttle Body

    Hey guys, I have the HP tuning software and I just ported my blower inlet and outlet. I just purchased a 78mm TB. I WILL need to calibrate my MAF because of all of the air coming in. I heard it is somewhere around a 10% increase on your maf table. But is it just the airflow vs. frequency change...