The horn hasn't got a lot of presence on the Pan, partly due to being stuck in the deepest, darkest part of the fairing. The solution? One par of Motrax horns later, and the Pan has a bit more of a honk and less of a tweet. The horns themselves (round bit in the pic)are attached to the bracket that holds the mirrors on, and located in the space behind the dashboard where the stereo speakers go.
It's simple enough to get into to extend the wiring from the orginal horn, but a pain getting the plastic off to get access. From what other people have told me, there's enough room in there to fit some serious horns, but there may be a need to fit a relay, to prevent the wires getting fried.
Got to admit, they do look a bit sad when you start stripping the plastic off.
Pan miles so far... Loads.