Put a wind deflector on, see If that will help with the wind noise. Had to make up some custom brackets as the Thule supplied brackets wouldn't fit OEM roof rack. :
THULE 870XT/871XT/872XT/873XT Fairing Wind Shield REPLACEMENT PARTS - YOU CHOOSE | eBay
Thule Roof Rack Wind Deflector 38 Inch Plastic Black - 8701 | HighSkyRVParts.com