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hi-fi sound

  1. E82 / E87 / E88 / F20 1 Series (2008 - 2014)
    Hello, I'm in the market for a slightly used 135i. How can I tell premium Hi-Fi sound from non-Hi-Fi equipped car? Is there any sticker or menu function that are only available with Premium sound? I'm assuming most of the time I can't crank up volume too much when there is a salesman right next...