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I haven't heard the HK but I have a 2011 128i with the base system and I can tell you one thing. It BLOWS! I just came from a 2007 3 series with the base system and there is a world of difference. It's much better in the 3. If I would have known I deff would have upgraded when I ordered it.
The issue that would concern me would be that the head unit is tied into the computer. Changing that out might create a few issues.
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