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  1. The Mother of all Horns

    RT Series
    BMW e39 525 530 Horn low tone - 420 Hz I finally found the receipt with my BMW CAR HORN. It installs plug-n-play right into the same connectors as the OEM horn on my 2016 R1200RT. sorry if I am being redundant, I know I mentioned this horn in horny-thread that just went by...though I could not...