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There are other options, but I personally has been using BavSound on my F10 AH5, F06 650GC, and currently on my G30 540i.
The later 2 cars had HK originally, and after an upgrade to BavSound it was quite an improvement. Not big, but it is plenty for a simple plug and play speaker upgrade.
I have installed to a few customers with HK, even on the latest F90 M5, all has been enjoying the improvement the BavSound gave.
It gets better after the speakers are loosen up.
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