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It comes down to this: Who do you trust ?
If you don't trust non-BMW personnel to work on your new car, then get the HK, which is the best you can do stock. If you trust an outside shop then spend the $ to get a full upgrade - i.e., amp plus speakers. Good quality equipment is going to run you at least twice the cost of the HK, but will sound better if properly chosen and installed. I opted to keep it stock and maintain my warranty...
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