So I am looking at aftermarket MAFs, and I am seeing 2 of every MAF, one "cold air" and one "stock". So tell me why there would be a difference? Obviously the stock MAFs wouldn't work with cold air kits if the difference meant a hill of beans. I understand that "cold" air is denser than warmer air, but like I said, why would a stock MAF work with a cold air kit (that doesn't really make that much difference anyway), but you need 2 calibrations in the aftermarket? Just curious as to your thoughts on the contradiction here. Also, I am interested in a BBK MAF... There are less expensive MAFs out there, but they are "stock" calibration. The BBK is the cheapest I have found with the specific "cold air" calibration.