There's a much louder & inexpensive almost direct replacement BMW Series 5 car horn for our late model GS's. The number is VEMO Horn - Low Tone (420 Hz) 61338381271 and there's a video on how to install it. https://youtu.be/MJVf70e1Lfo It's much louder because it's usually under the hood of a car and now it's out in the open. It uses the same plug that's on the GS. I got mine for under 15$. I used the horn circuit on the Denali's Cansmart ( Hexcode the same ) for accessories ( and not for a horn ) and just plugged the horn into the bikes horn circuit. This horn draws a few more amps than the stock horn but will work for normal short horn blasts. If you stand on the horn for a while it will be timed out by the bike's CANbus system for a short time as a overload. I've used this horn for over 10K miles and it only overloaded the bike once when I tested it for almost a 10 second straight blast. For normal blasts it works fine and is attention getting plus the fact the Cansmart flashed the forward add-on lites. If you don't need the Cansmart/Hexcode horn circuit for accessories than just plug into the the Cansmart. For my bikes accessories like radar, cell phone and tank bag electrics I just selected the horn circuit on the Denali/Hexcode app to be accessories and not horn. I also plug my heated vest directly into the battery. Hope this is new to some of you.