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I have a '17 M240 with the factory HK sound system. I replaced all the in-car speakers with Focals and kept the BMW under seat subs and amp. I also added a custom box in the trunk with 2 Sundown Audio 10's powered by a Sundown Amp. The system sounds worlds better. All the harshness from the HK tweeters is gone, mid-bass and midrange are greatly enhanced by the Focals, and the Sundown 10's absolutely thump. At this point, I can't imagine doing anything else. I'm very pleased with the way everything turned out.
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