FWIW, I mounted my horn under my gas tank. It's a Fiamm Road blaster, the "horn" section points out the front of the gas tank. You can't even see it, but you can hear it. It sits about 1/4'' off the top of the cam cover. I used the old threaded holes from the AI that was removed.
Look no horn (visible):
[ This message was edited by: sweatmachine on 2007-03-12 09:09 ]