What kind of car? What kind of MAF sensor?

If the car is factory turbo and designed/calibrated for a draw through setup, it needs to stay that way, also the sensor type plays a big role.

My car was an NA to FI conversion with a *hotwire* MAF, the IAT sensor is made in the MAF unit, so the MAF stayed where it was and became blow through. Hot wire is the only sensor type that can deal with vastly variying densities of air, a flap or vane sensor won't like pressurised air, neither will a karman, but a hotwire truly measures MASS irregaurdless of density. My car runs great, but each car is diffrent.