Pulsating wind noise

Has anyone expierienced a very loud pulsating wind noise when you lower the rear window on a 4 door model G6? Mine is a 2005. It starts at about 35mph and gets worse with higher speeds. Seems like the right rear is a little worse than the left rear. Only happens when the rear window is down, and the fronts are up.
Thanks

If you are driving down the road only with the rear window open, you will have that loud pulsating wind noise. Basically it's the outside air forcing it's way into the back of the car but becoming stuck at the back window. I've had that noise once or twice... If you have a sunroof I would crack it open if you open the back window, to relieve the air pressure in the back OR crack a couple other windows, that's should help out as well.