on my 4x4 after about 2-3psi ish the AFM would be fully open

this wouldbe the car's fueling limit.

so the extra injector driver thingie would register this boost and inject XXX fuel based on the map sensor input... it would be taking into account that the std management adds SOME extra fuel.

mine fueled ok @ 6psi up to about 3k without extra injectors above this is was lean as fook