Thread: Upgrading 3.9 Air Flow Meter to 4.6 (wiring)

very interesting when i get time ill check some of that out a bit futher ta

You need their ECU chip as well to do it.

i wonder if it gives any better performance,

In it's self the GEMs airflow meter flows more air, than the 4AM and combined with the chip would make a differance. But really this is a wide open throttle thing. I reckon the stock one can flow enough air for a basic engine. You have to remember RPI are setting these engines up for sports cars like TVRs Morgans MGv8, Cobra replicas etc so they are looking for some bigger numbers from them. Not like here where you can just can an LS1 or small block iron chev, ford small block etc.
Frankly I'd reckon you'd be better brushing the airflow meter all together and using an aftermarket ecu and MAP sense if you want some bigger numbers. RPI chips aren't cheap plus the meter.