Whenever I have all the windows up but the sunroof open, I get this loud thumping noise inside of the car. If I crack the window slightly, it seems to break the air circulation somehow and the noise dissapears. It almost sounds like you have a flat tire. I thought this strange on my 99 9-5, but then when I traded in and purchased an 03 9-3, this one did the same thing. Ahyone have a similiar experience??