Installed these on a 2012 Forester using the Thule 450R Feet.
Tested them up to 85 MPH. Totally silent till you get around 80, then you may detect slight wind noise, but nothing that will cause the need to turn the radio up.
Overall an excellent produce and well designed.
Had Yakima round bars on previous cars and the noise ranged from very noticeable to unbearable (without a faring).
No need for a faring with these.