I've read other threads about window/door molding foam leaks causing wind noise/whistling.
The only noise I have noticed so far is when the passenger window is all the way down, and no passenger is in the front, the seatbelt buckle keeps banging on the side of the cabin.
An ugly solution for reducing air noise, which allows for very quiet ventilation. There are several aftermarket suppliers, and most clip on with ease.
Recommended only for those who like to have their window down a bit, to create air circulation, creating minimal sound, and allowing open windows even during rain.
It works, but it makes your car look like a taxi in ________ (<- insert name of a country you like to mock).