I noticed a similar problem with wind noise while test driving my VX from the dealer. At first I thought the doors were not shut completely. That wasn't it so I pulled over and took a closer look. The rubber gasget around the inside of the door had come partially off its "holder thing" (on both doors). I tucked it back it and problem solved. (I could actually feel a slight breese).
I find just about the same noise from the Weather Tech vents. They are great and fit perfect. With the window up they also generate a bit of wind noise. Good luck.

ps this is my first post so I hope it helps someone!