[mwebb]

yes
calculated load with volumetric efficiency

will show that the SNAKE OIL does not "improve" anything .

MAF values with fuel trim can show similar results or not,
as i think some cylinders will be lean and some rich , using that JUNK ,
total fuel trims will not change much MAF will be higher .
http://www.autoservicetech.com/vecalculator.html
but calculated load with VE under the same conditions with and without the HOAX installed would be easier to see

i would use the ATS Escan VE test screen , but the link above will be good for an
A - B comparison
imho