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Bog standard hifi in M340d
I'm considering an M340d that I've seen. Ticks all the boxes except the HIFI is the bog-standard one and has no speakers in the corner near the mirrors (I'm sure there's a scientific name for them). My question is, is it possible/advisable to get the speaker system upgraded? Would need a specialist hifi installer I imagine but would it disturb any functionality in the car such as bluetooth , etc....
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