Cut this from Jeepersjoey's post in another thread:
Today I installed my roof rack.
Wanting to know how much noise it was making, I opened the sunroof.
Dear god there is awesome sound dampening (acoustic glass??) with the sunroof.
Closed = small amount of wind noise.
Open = HUGE amount of wind noise.
Yea...they are in the right spot. Not only did I measure, but they are aligned with the notch on the inside edge of the rack.
Wow...great job, BMW!!!
Paul
I have Thule roof bars. Thule recommend a specific gap between the bars themselves - but say use trial and error regarding actual placement.
I had a quick look on my x3 but could not see "the notch". Anybody else seen this?
Swisstony