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In theory the airflow through the maf should be proportional to the pipe sizes. Try just calculating the ratio and apply it to the voltages in the VQ table. Hint, the voltages will be quite a bit lower and you will loose resolution in the lower ranges.
Lets say that the original is 3 inches and the new one is 4 inches. The ratio is .5625 so the voltages would be a little more than 1/2 for the same flow.
To be more precise you should use the actual inside measurements from both pieces. Just remember that is proportional to the raduises squared.
This sounds so smart I want to test it.
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