Quote:
Originally Posted by schadenfreude
with people having their aftermarket grilles warping, the vents have to help with heat dispersal.
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That is completely false. The side vents with the embedded turn signals and the ///M3 logo is completely aesthetic, aside from the turn signal but the vent itself is useless. There is no heat dissipation that occurs there, and there certainly is not an exhaust port routed up to it. BMW even commented about it once. If it had an actual exhaust port hooked up to it, the car would get quite dirty in a very bad spot, straight down the side of the doors.
I know for a fact on the e46 M3 the fender flares were purposeful. They wider rubber on the wheels required flared fenders. While I don't know to the level of certainty that I do for the e46, I am quite confident that the e92 fenders are in the same boat. Flared to accommodate wider rubber.