A great write-up by The New York Times complimenting the
N20 engine in the 528i from a couple years ago:
http://www.nytimes.com/2012/08/12/au...ewanted=1&_r=0
Puts me at ease about the X4
xDrive28i. I'm not one of those gearheads obsessed with engine noise. Less engine noise, the better... but obviously not to the extent where it's completely silent, just enough for pedestrians to hear me approaching.