Logging
If you have the means to log a couple data streams it should be pretty simple to prove.
On the WRX, you have a MAF (Mass Air Flow) meter that reads directly in grams/second ( if you have the proper logging software) it is a 0-5 volt output so even a peak hold volt meter could be used. Just set the boost to a known value and log the mass air flow at a known rpm. Then turn on the WI and adjust until you hit the same boost setting at the same rpm and compare the new MAF numbers.
Larry
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