Has any one used THIS Product??
I have a Pro-M MAF.
I still agree with the reference in the original post. The return on investment is just not there unless you have a highly modified engine.
Even if a vehicle needed a re-calibrated MAF I don't believe it can be calibrated accurately at the factory.
A key point in the referenced article is the way a MAF functions. It measures a
portion of the air flowing over a heated wire. The calculations are based on how this "portion" of the airflow relates to the total flow through the meter.
Let's say you have installed a new air filter kit. Let's also say the new kit causes less air to flow over the wire and more air through the rest of the MAF. The MAF's output will be wrong.
It seems like a Pro-M calibrated MAF would be the perfect cure. The problem is, Pro-m can't duplicate your flow characteristics on their flowbench and have it match exactly to your truck.
If you don't need or can't use the extra flow from a ported MAF it can't help your power output and may even reduce your power.
A cool thing with our truck's computer is it corrects errors. If the MAF is reading off by 10% the computer will make a 10% correction to the fuel injector flow rate. If the error is 10% at idle and 7% at half throttle the computer will store both corrections and use them where needed. There are about 15 "fuel trim cells" the computer uses to store corrections. They match up with various load vs throttle position combinations.
There is a down side to this. Any tricks you try to play on the computer get "learned out" very quickly and end up getting stored as corrections. The computer will detect a change in throttle position very quickly and goes to the "fuel trim cell" for instant info on how to fire the fuel injectors. When it starts to get rich/lean info from the O2 sensors in the exhaust it will make additional corrections.
Adding a component that causes a series of corrections seems like a bad way to improve performance.
kw