At the M-school, the instructors were very clear that it would be ok running A/C on the M3s (not allowed to run w/ windows down), as > 80% of WOT results in AC disengaging, which they asserted really wouldn't affect lap times in the competitive timing.
Originally Posted by swamp2
Here are a few discussions on this topic (there are more).
Here is another link
with almost direct evidence.
is a source also claiming no BER in the US.
In short, after reviewing all of the posts here and on other sites I would say that all NA model years of the M3 having BOTH features (AC and Alternator disengaging at high or WOT) is very debatable. It would be great to put this one to bed.