I just mounted a Stebel horn, but instead of mounting the whole horn, I separated the horn from the compressor.
The compressor is mounted under the right hand inner cover in front of the Rostra CC and the horn is mounted on the rear of the left front fork.
The horn is connected to the compressor by a length of plastic tube.
Oddly enough the ID of the horn when separated from the compressor is the same as the OD of the front forks.
unfortunately the NetNazi's here at work will not allow me to connect to my Smugmug account to get pix, so I will upload pix when I get home.
Until then here is where I got the original idea.
http://www.sportbikes.net/forums/fz6-mods/343461-hidden-stebel-nautilus-horn-install.htmlIt's a bit of work to do but since space is a premium this gives you some options. Plus it gets the horn out from under the plastic.
I can detect no delay with the separated horn(the OEM horn is still operational) and it is LOUD!