I recently installed a roof rack (with Trek bike attachments) and I am getting a lot of wind noise on the freeway. Is there anything I can put on my car to help eliminate some of it - or do I just need to deal. I have seem some cars with a visor (name?) but not sure what it is called or where to purchase one. The person I spoke to at the local dealership said I should just deal. -David '98 Red GLX