However the MAF IS calibrated to a specific Injector size. They are NOT a one size fits all electronics...
Therefore he used a MAF calibrated for the larger 19lbs injectors so the PCM would basically see nothing changed. (Just would dump a lot more fuel)
The PCM may control fuel enrichment, but it's based on the signal from the MAF and the PCM's preset tables. (Why an MAF optimizer or S-AFC works!)
...don't worry about the Taurus shot. He's just jealous you have more doors than he does...
