Re: switch 164's AFM to MAF?
Their kit appears to include a calibration box which takes the signal from the MAF and turns it into a voltage that mimics what the flap-type air flow meter would have produced. In this way, the engine's ECU doesn't "know" that the signal it's getting hasn't come from the old flap-type airflow meter.
To be honest, I don't think I'd bother because the flap type meters are extremely reliable and I wouldn't have the time or equipment to "map" the whole system again and optimise it for both power and economy. Maybe if they produced one specifically set up for the 164, AND I had heard good independent reviews of it, I MIGHT be tempted but just using one of their universal kits would, I think, be a bit risky. Too lean and you trash your engine. A bit too rich and it gets very thirsty. A lot too rich and it will trash the engine.