Its those giant side mirrors making all that noise at highway speed, imo. As far as the "rain gaurds" are concerned, that was their design intent. So you could crack the window open and not get rained on. While your smoking i guess, lol.
My experience with these things is it depends on the design. If they stick to the outside and bulge out alot they are noisy and noisy when the window is cracked out and look terrible. The ones i have on my six now, i love. They tuck into the window and sit flush with the car. Looking at it head on you can't tell their there and make little visual difference from other angles. As you tell in the pics below, they're very subtle. They added no additional noise with the windows up. And after install, i found it to be much quieter with the window down a little bit making a huge difference in how much wind noise was generated while traveling. And fwiw, i'm not a redneck or a smoker.
