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Model S roof bars : noisy?

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I think it depends on which version of the car and racks you are asking about. I can tell you on early Model S's, with the retractable roof and that version of rack, they are pretty loud. I actually took mine off because they were too loud and had about a 10-15% range hit.

The newer racks look a lot more aero, and likely have less noise, but I cannot validate because I have never used them.
 
I actually think they are pretty quiet (2021 LR+ pre-refresh). Previous car was a BMW 3-series. On that car they were crazy loud, with annoying whistling at moderate/high speeds. On my MS I leave the roof rails on year-round (kind of a PITA to remove / re-install) and the noise doesn't bother me.