I picked up a 125 decibel horn from New Speed 3. An easy change. It's considerably louder and doesn't sound so wimpy, but it could still be a bit louder to get attention of the idiot cagers. It's back is brass, but a little semi gloss black spray paint took care of that.
Horn

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2007 Triumph Rocket III, 2006 Triumph Speed Triple, 2004 Honda NRX1800 Rune, 2002 Honda GL1800 Gold Wing, 1998 Honda GL1500CT Valkyrie & 1988 Honda CBR1000 Hurricane
and my wife's
2005 Honda VTX1300R & 2004 Honda VT750CA Aero
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