front wheel bearing
For over 9 months, my driver's side front wheel was noisy... I was told it is due to improper alignment, which is a result of having my KW V1's... Mind you, this was looked after a BMW dealership.... They even claimed to have checked my bearings, and told me it was fine.
After changing my front bearing (thanks Ivo !) my car is finally quiet.
So - if you are getting a lot of noise, this could be it... Bearing was most likely damaged due to potholes I've hit over the past year or so...