certainly explains why some fried their pcm's. I could imagine that power socket getting pretty hot on the board with an extra resistor thrown in.We cajoled a member here who made the mistake of buying one of these into cutting it apart.
What we found was a resister between the power and ground of the MAF power lines.
Here's how the MAF works: The sensor sends an electric current over a wire that is exposed to the air intake. The incoming air cools the wire. The sensor can tell based on how cool the wire is how much air is coming into the engine. This information is encoded into a frequency based signal and sent back to the engine computer.
This "Chip" taps into the power and ground lines that supply the MAF. It doesn't even touch the MAF signal wire. It is -literally- the equivalent to sticking your fingers in a light socket and hoping that your furnace runs better.