I was also looking for roof bars and a cargo box for my X3. One option that does work that you might want to look at is the Whisbar cross bars from Yakima. They are wide when viewing from above but are very thin in profile (viewing from the front or back) so they don't have drag and will reduce any wind noise.
Their mounting options will work on our flush roof rails.
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2014 EBII 435i xDrive M-sport
Gone: 2011 TiAg F25 X3 xDrive35i M-sport
Gone: 2008 TiAg w/Coral Red E88 135i Cab M-sport
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