As mentioned earlier, the Prorack 'S-Wing' roof rack is specifically designed and engineered to nearly eliminate this noise and Prorack owners swear they don't hear any noise or whistling at all.The Prorack Roof Racks Sydney is precisely dimensioned so there is no break-away frequency generated from the flow of wind around the bar – this is its secret to eliminating the wind noise. For the automotive world this design was and very much still is a revolution in roof rack design.
https://aeytimes.com/ideas/117720/Prorack_Roof_Racks_-_The_Most_Beautiful_And_Adaptable_Roof_Rack_In_Australia/
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