Dude,
Take the advice and ditch the idea of a rising rate FPR. That technology is only there because some ecu's cannot be chipped or hacked that easily. If you can't change injectors or program the ecu then an FMU is one option. Its just the least desirable. With todays OBD II and even OBD I systems you don't have to worry about that.
Once the computer has the right injector size input into it then it will automaticaly add the right fuel as long as it can sense the amount of air going in.
The ford system with the MAF sensor is Far Superior to a MAP sensor anyway. We are pretty experienced on this board now with setting up a correct fuel management system. If you are still entertaining other options then there is something you are not telling us, or you don't trust us, or you are hard headed.
Understand we are here to help if you put yourself in receive-mode AND if you give us some pertinent information like the CAR/Engine/PCM setup you are actually talking about.
warmonger
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
See My Mods
'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black