What is the component of the rear roof area of 2008 bmw cars?
What is the component on the rear end of roof area of 2008 bmw cars
Answer
You must be talking about the "shark fin". bmw uses this to run the stereo and cell antenna to this location. they use to use a "bee stinger" for this purpose as well but even before that they ran the antenna to your rear window, incorporating it with your rear defrosters.