What is the 'AFM' ? I assumed it was an Air Flow Meter but then you started talking about it opening and closing!
Also, when you say injectors to make for more airflow do you mean fuel injectors - cause they only inject fuel and make no difference to airflow - although a boosted engine will use more fuel and will need bigger injectors to deliver it.
Usually on a boosted engine you will use a MAP (Manifold Air Pressure) sensor but Air Flow Meters still work fine.