Andrea, the MAFT and GM MAF combination are really only of benefit to those
who, due to running larger turbochargers, are over-running the stock air
meter.
The GM meter and MAFT translator box are not quite linear and do require
some tuning to get dialed in.
I have been running this set up for several years without too many problems
but the Mitsubishi airflow meters do work better on cars not flowing a lot
of air.