Some information I got from Roman@ESS via PM.
Quote:
Mass air flow sensor integration is always ideal when attempting to control the ECU. It has a higher cost to add to a piggyback controller but in our opinion is a must have. More control is always a good thing when you are not recalibrating the actual ECU software.
You can run a piggyback without MAF integration on the F series when boost is increased and your AFR's overall will be fine because it runs a target based system. One of the advantage of a controller that can manipulate the MAF signal is that you can have the system add fuel during on / off throttle transition. This makes it not required but a better option for ideal performance in our opinion as the motor has access to additional fuel when needed during this time.
The second advantage of a system that can integrate with the MAF is controlling max MAF values. Without MAF integration you can exceed max MAF values when boost is raised and that can cause drivability issues, limp mode, stalling etc.. The main advantage of having MAF integration in the F series is really having the controller not allow the system to exceed max MAF values. Exceeding max allowed MAF values can also be stored and detected which is not good.
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