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Lozza47,
I just upgraded my M240i with the HiFi system by only changing the speakers. A local car audio shop installed the Bimmer Tech Alpha One speakers (woofers, tweeters and midrange). They also swapped out the blank sails with the HK ones to hold the tweeter. The changes have been dramatic and everything sounds great now. I don't feel there's any need to update the amp to great sound if you switch out the speakers.
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