I have OEM roof racks, which I've run with either two bike racks or a Thule roof-topper, and the wind noise is negligible. Maybe something else is going on?
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2013 535xi, Carbon Black, beige interior, M Sport package, HUD, DDC & ARS, ACS springs, Kelleners wheels
2010 Z4 35i, Crimson Red, beige interior, 6sp manual, Adapative Suspension
2000 528i, Cosmo Black, beige interior, Sport package (retired)
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