You do a good job of showing the exact difference between regular and M-Sport, but it was public knowledge that the M-Sport had better cooling. It was discussed at length before on the forums. Usually this comes up whenever people ask why there is no fog lights for the US-Spec M-Sport model. BMW's official answer is that because some areas of the US have extremely hot weather, that they had to remove the fog lights so that the additional radiators get more air up front.
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