[Hammer]

I'd have to go with Pro M. You can't beat a meter that is individually calibrated for each application. This is especially important in blown applications.

As a side note:
If her kit uses an induction setup with an elbow right before the MAF (which is most likely because mine does), Procharger will not support drivability\idle problems unless she uses a n MAF like the "Univer".

Standard MAFs that use a single sensor at the top are susceptible to mass airflow signal degradation due to interference from the elbow...

I would say try using a standard Pro-M meter and see how she runs. Sometimes you can "turn" the meter around to get a good reading, but if she continues to have idling\drivability issues, a univer type may be the only answer. (Yes, they're expensive...)

Here's more info:
http://www.pro-flow.com/new1.html