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Re: Noisy Scenic Roof Bars
All square section roof bars will whistle at speed. At least I've never known a set that didn't. Ours always whistled when they were just the bars, but were happily silent when the roof box was on top of them.
The contoured bars (Thule Aero etc.) claim to be better, though I've no personal experience.
In any case, they're wasting fuel and therefore money when you don't have a load strapped to them. It would be better to take them off when you're not using them.
I do in fact have aero bars, the whistling seems to come from under the bracket which sits on top of the roof.
Currently in fa66ster's garage:
Scenic Maxim 1.9 dci