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Are you sure it is not rpm based and that it is just the mph? My X1 makes a flutter type whistle at 35 mph and at about 77 mph both of which happen to line up at 2,500 rpm. I notice that when I am on the accelerator slightly it will make the noise louder vs when I am just maintaining speed.
The point I am making is if it is at that speed regardless of which gear you're in I would look for exterior aerodynamic interferences. If it is dependent on, lets say 6th gear, then it could be rpm based and coming from the engine.
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2011 E92 335i | 11.7@125 SOLD
2017 Camaro SS | 12.7@114 SOLD
2019 Audi TT RS | 10.5@130 SOLD
2020 F97 X3M | 11.0@123
2023 G80 M3 xDrive
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