Quote Originally Posted by nextelbuddy
... its bad because the stock MAF sensors aewre not designed to SEE any boost...
Correct, nor vaccum. The element is in a window that samples a fixed portion or ratio of the air passing through the sensor housing. The ECU knows the element is seeing 1/100 (made up number) of the total MASS of air passing through the MAF housing. MASS is the total number molecules, density is molecules per volume. The "ideal gas law" states the volume of a given MASS of a gas is a function of pressure and temperature. SO, no matter what the PSI or tempature the MAF is still just metering mass.