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I believe Sport mode (at least on the 650i with M Sport) keeps the flaps open more than Comfort. You can get some decent noise in Comfort, but you really have to nail the throttle. Driving around town in Sport - while not as good as opening the throttle wide - sounds pretty good, and I use Comfort as a "mute button" when I see a cop or am in a part of town I want to decrease the attention I receive.
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