Maf Q
The MAF is a sensor all it has to do is send reliable info to the pcm without restricting flow, the stocker does that perfectly.
The aftermarket sensors try to trick a pcm with a stock tune into a more ideal AFR, thing is if the car is tuned right that "trick" ends up pushing it lean not a good thing. The tuning to get AFR right in the programming is MUCH cheaper than a Granatelli too so basically they have no redeaming features they are just junk designed to con you our of your money.

