After 15,000 miles tune up (or coincident), my RX330 has a mysterious wind noise from somewhere on the back when I exceed 60mph. I check the window (pinch it down), check the sunroof, slide the cross bar toward the rear, check the seal on the hatch back. Everything looks OK to me, and does not fix the problem. The sound is anoying for a $40K car, but I hesitate to bring it back to the dealer because first, how can I prove to them that the interior noise level is more than before, and second, how much chance that they can find the real cause of the problem.
Yesterday, I did another visual checking on the rear hatch, and here is what I found. Around the hatch, there are several holes, plugged by black rubber seals. One of the rubber seal at the top side of the hatch is missing, exposing the hole. I temporarily tape the hole, and this morning drive, the noise seems to be gone. :D