M5 Guru (>2000 posts)
Join Date: Mar 2004
Thanked 193 Times in 133 Posts
I had exactly the same problem - wind noise at 70-85 mph that made me close the roof at highway speeds. I noticed that when I pushed up on the front edge hard, then noise went away. On long trips, I would jam a towel between the inside roof and the sunroof to put enough force on it to eliminate the noise.
I took it into my SA, and explained the problem, and he made an adjustment, but I still had the noise. Then I rode with my SA so he could hear the noise, and showed him how it went away when I pushed on the leading edge. It took him a full day to get rid of it by adjusting the roof, then road testing, but he did, and the sunroof is absolutely quiet now.
I didn't get into the details of what he did, but there is evidently a series of adjustments you can make to the sunroof to change the angle and/or force it makes against the front edge when closing. It can be fixed, and if your SA is good enough, they should be able to do it.