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When tuners modify MAF signals it is to account for a limitation of the MAF signal. This is almost always done with forced induction builds. The MAF sensor itself is not the limitation but rather the DME's interpretation of that data is the limitation. So what they do is put in a specific resistor to alter the signal, let's say by half, and then alter the DME tables to read that halved signal where it would have normally read the unmodified signal. This way they can get 2x the effective range of the MAF, allowing them to read the extra air from the forced induction system properly on the stock MAF. This is a completely different usage case than what you are doing here.
Their goal is to provide the correct reading when they have more airflow. Your goal is to trick the DME into reading an incorrect MAF signal
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