IMO, BMW did a pretty good job on the audio system. But to improve it, you don't need much. Better tweeters up front, and more power. A real subwoofer is optional.
You could go as far as adding a xover, either passive or active to say the front door mids, which would clean up some of the vocals... But when you're rolling on wide 20" wheels, road noise and NVH rule out any semblence of sound quality.
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2012 X5 xDrive35i Sport Activity - Alpine White - M Sport Package
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