I have a similar issue. I had zero noise until I installed the LR brand bike carriers. To install them, one must remove the rubber strip that runs the length of the cross bar. This reveals a track in which the bike carriers slide and then are locked down. It is very easy to install and remove them. However, the expose track creates a very loud whistle at any speed. I thought about cutting the rubber strip to cover the remaining exposed track. Before doing so, I have called the local LR dealer to see if they have a better solution.