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FWIW, I upgraded my Hifi speakers, amp, and subwoofers at different stages with Bavsound (got a killer deal). The amp made the most difference in my system, and even though the bass is much more clean, it's not much louder. Not sure I'd pay full price for the sub upgrade, and it's definitely not as loud/thumping as the stock HK system in my brothers 428i.
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