The MAF is actually a small part inside the black plastic tube that we call the MAF. All the MAF cares about is that the tube diamter it is bolted in stays the same, i.e. you could unscrew the MAF sensor from the black plastic pipe it resides in and move it to a pipe of different size and it would be a problem, but to move the whole unit to a different size pipe wont affect it. The MAF is metering the air through that one small section of known diamter pipe it resides in.
Still wondering if your A-SAFC is wired into the O2 sensor or the MAF signal.