What do you mean whirring sound? Can you be more specific- i.e. does it sound like something flapping in the wind? Or the sound of a blender on ice crush?
2013 X3 35i, Dealer Delivery
2011 550i M Sport, European Delivery
On Order: 2014 550i M Sport, European Delivery
Gone, but not forgotten:
2006 530i, European Delivery
2008 335i Coupe 6MT, PCD