1) Different tube diameters, basically. Even a millimeter difference is sufficient for screwball reading. Plus, the relationship between air flow and MAF sensor voltage is non linear, so it's also not a simple across the board correction to fix it. I've done some serious soapboxing on this subject on i-club, I'll go find it in a few minutes.
2) It does, but not to the same extent. Another limitation is that the stock ECU can't monitor knock at about 5500-6500 rpm, because at those RPMs normal engine noise is the same frequency as detonation, so the sensor is disabled. That's where CAIs, if they're particularly poorly designed, can cause damage directly.
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FWD is the new AWD
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