MAF Sensor scale added to XML (attached)
However, the voltage scale is hard coded rather then using values from the BIN.
This Voltage scale is based on that used on the 2001> WRX, so not perfect, but gives a representation. When you rescale a MAF you change the g/s figures, so the voltage Axis is irrelevant really.
I will see if I can spot the voltage scale in the BIN in/around the MAF Scale MAP.