E46 M3 fake brake duct?!

[crosvs]

I noticed earlier today that, whereas the driver's side front brake duct is "real" -- e.g., there really is a passageway through the front air dam more or less directing air to the front left brake -- the passenger's side front brake duct is ... well ... FAKE!! -- there IS no cut out for the air to pass through; instead i can see what looks like cut out indentations, almost like the thing could be manually cut/popped out if desired.

Explanations?!

Seems like it would be pretty bad to do track events like this, that the passenger's side would overheat far faster than the driver's side...........