Ok guys, I know this is an old thread, but I am having the exact same problem in my new coupe. I looked under the seat but could not find any vent of any kind, but the sound is exactly the same to what you are all describing. The only thing I see is a speaker cover, but i dont think anything could fall into it. I have the noise what souinds like either in the door or under my seat. It is driving me CRAAAZYY.
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