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 AirScreen XT Roof Rack Wind Fairing L - 44in. (Black) — Panda Motorworks
Unboxing and Install of Thule 8701 AirScreen Fairing 38 on a Bmw 3 series with OEM roof racks - YouTube
Thule AirScreen XT Roof Rack Wind Fairing M - 38in. (Black) — Panda Motorworks
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Thule 8703 Roof Rack Wind Deflector 8703 - Tint World
Thule AirScreen XT L | Thule | United States
Thule Fairing (38" Medium) Wind deflector reduces noise and improves mileage at Crutchfield
AirScreen XT for Thule Crossbars - 44" Long Thule Accessories and Parts TH82WV
How to make roof rack wind deflector spoiler inspired by Yakima? - YouTube