Have the very same issue here in Perth, Australia on my 2013 F30 328i with HK sound. Rattling was unbearable so I took my Beemer back to the dealer where they apparently added foam into the side skirts. Fixed the problem from about a month, now the issue is back. Will bring it up again with the dealer at my next service.
Annoys me, as it must annoy everyone else! This sound system by HK was apparently designed together with the birth of the F30! Hmm...
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