mostly the interface.
the gen 2 has a much cleaner, MAFT pro-like "keypad" that you use to input settings, along with more options, etc. the MAFT gen 1 uses DIP switches and knobs to input settings.
there's your problem. the idiots messed with the wiring, probably ended up unplugging power to the MAFT or the MAFT input signal to the ECU.
#1 reason why you don't let anyone touch your car.
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