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FWIW I did a full retrofit of the B&W system in my X5 last year. It was very expensive and quite complex, as it involved cutting the headliner and gluing the speakers in place, running extra wiring all over the car for the speakers and lights, rewiring the RAM and Booster connections for the additional/changed wiring, and more I’m probably forgetting. Suffice it to say, it sounded a lot better, but for the vast majority it is probably not worth the cost/effort.
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