I too have a 2011 X35i (sports+premium+cold weather)with 8000 miles on it. I can hear a rattle inside the driver side door panel, but for the longest time could not figure out the exact cause. Then today while driving when I pushed against the leather padding on the door I could hear the same sound and it was as if there was a gap in between the padding and whatever is behind it. So you are probably right about he insulation tape being needed.
A second source of rattle is the speaker-grill in the center of the dash. And finally a third source of rattle is the passenger side either a/c vent or the surrounding dash area.
Does anyone else have these especially the occasional speaker-grill rattle?
-Rohan
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