I just leased the wife a '11 740i. Overall it seems to be a great car but at idle it has a strange bassy drone at idle. There is no vibration associated with the noise but it has the db characteristics of a sub woofer. The noise disappears off idle. I did not have this sound in her 535. Anyone else experience this? And yes--the stereo was turned off so it's not the subwoofer in the car!!!