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F15 with Harmon Kardon - Speaker Upgrade Worth It?
I have a 2016 F15 35d with harmon kardon and am wondering if anyone has done either the bimmer tech or bavsound sub upgrade. They seem to only recommend the sub upgrades and nothing else. If anyone has done it...is it worth it? Any other additions that you would recommend outside of the subs only. My current system is just OK in my opinion. I was expecting a bit better from a premium harmon kardon setup.
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