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Mine was done at the factory. I have the BMW crossbars and a Thule 1800 box. Works perfect. I also have the Thule Aerobars which I used on my previous X5. They did whistle a bit. The BMW OEM are silent.
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2021 X6M Competition, 2021 Audi SQ5 Technik, 2013 Audi S4
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