Mine started creaking and rattling from the rear, just one week after buying. Worsening day by day. Noise seemed to be coming from the heat shields plates which partitions the muffler/exhaust from the base of the trunk. 2 of the 3 heat shields were creaking with applying light pressure. After readjusting the position and tension of the plates, the noise have improved but still noticeable when going over bumps and on gravel roads.
Didn't expect a new Bimmer to sound like my old school bus.
