MAF sensors tuned for mods?

[SappySE107]

I have read a few posts on various boards talking about having a MAF that is calibrated for a cold air intake, or ram air, or whatever. From how I understand it, the MAF is calibrated to the engine and ECM, not to what mods you have. So, wtf is up with these posts and am I wrong or is this just more bullshit?

[Anonymous]

I could understand having a larger (better?) MAF FOR a BETTER CAI setup, but yeah I totally think the MAF is calibrated engine and ECM, since my MAF is totally removed and my car is quite driveable.

[ikessky]

Isn't that kind of like the thinking of the IAT mod that people do? I mean, the MAF is reading incoming air and basing whatever it does off that right? If that's the case, I can see why you would want a bigger dimension MAF (so it's not restricting flow), but not why you would need to calibrate it.

[SappySE107]

Calibrated for the computer so it gets the proper input (resistor packs or something are how they are adjusted) makes sense...but I don't comprehend this idea for tuning for a cold air intake.