Actually don't believe your BMW stealerships re: upgrades and retrofits. I am pretty sure there are a lot of good BMW tuners in the US that can retrofit B&O even from the 6 speaker system (it'll cost though because the trim would also be changed). Upgrading from 16HK to 16B&O solution is very easy for any professional installer. So if you're lucky to live in an advanced country/city and have the $ - it's not a problem whatsoever.
However at the price point BMW charges for B&O I'd strongly suggest you upgrade to an aftermarket custom system (Focals, etc.) - would probably end up paying less for more.
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