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Great information everyone.. I know everyone says that with every model year, the HK sound is getting worse.. and I have to agree! The HK in the Z4 is truly the worst system I've experienced in a BMW.. to the point where I thought something was broken/loose. It rattles! Increase the "speed volume" setting to max and you'll think there's something broken. In previous systems it's tuned so that you can max out almost any setting and there's little to no distortion (not to mention it won't rattle).
Keeping an eye on this thread! Hopefully Bav releases an upgrade. I'm thinking of applying dynamat in the trunk to try and dampen it.
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Current: <pending> | '20 Z4 M40i
Past: 09 M3 Coupe DCT (sold) | 11 1M Coupe MT (sold) | 15 i3 REX (returned) | 15 X3 35xi (sold) | 16 M235xi Vert (returned) | 18 M3 Comp Ultimate DCT (sold) | 20 X5 M Comp (totalled)
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