is the noise a "whine" or clicking/crunching noise? my wheel bearings on my vk had to be changed, and they were crunching and clicking, the slower the car wen the slower the noise happened, when driving in a straight line, do you feel the car jerk sideways? as if the wheel is slightly loose? can you keep your steering wheel dead straight and not have the car pull eather side and have to correct it? (the jerk is only very minute) if it does this, replace your bearings.