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Originally Posted by Xiaoxi
The way he was able to break down the concepts into such clear layman terms is amazing! Although his comments have me wondering... does every little change connected to the drive train technically require a re-tune? ie changing the stock cat to a high flow cat or catless would alter the exhaust flow. Does that technically require a tailored re-tune?
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No.
Just as the ECU has enough intelligence to work around a piggyback throwing lower than expected boost values and adjust accordingly, the increased flow from an intake, exhaust, dp's etc will result in similar adjustments.