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I find the HK sound system to be good enough (and this comes from someone who is picky about car audio quality). You can go ahead and tinker with the EQ settings for better customization. If I were you, I'd visit a local dealership that has an X5 or X5M with B&O and test it out yourself.
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2001 X5 4.4i - sold but never forgotten!
2014 X5 xDrive50i
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