Thanks for the response. I do have the BMW brand, it's so weird, I thought I didn't install it right but after looking at it, it's basically idiot proof, there's no way you could screw up the installation. In any case, I guess I'm just out $35.00 for this "wind tunnel vacuum maker" on the roof of my car... I'll take it out tomorrow. It's so disappointing how this thing is designed, I've had similar product on my other car (Honda Civic) and it worked great on that little Japanese car, I still prefer my "German Rocket" over 99.8% over the Civic! :p