Excessive wind noise in X3 interior
I also noticed the same noise issue when I first drove my 2011 X3 3.5i which was built in April 2011, however, as this was my very first BMW automobile, I assumed it was normal for this type of vehicle.
I've had the vehicle for over a year now and that is basically the only thing I can say I don't like about the X3. I intend to bring this wind noise issue to the attention of Fields BMW in Orlando when I take the vehicle for the 15000 mile service. Hopefully they will be able to resolve the problem.
Will post if the problem can be fixed.