A few folks make those Stebel type horns, Fast Eddy has one or two on his site, Brent has them as well. They are about the size of your two fists put together, reason is they have a wee air compressor inside and a dual tone horn. The two tones combined make people see it with their ears.
When I wired up mine, it was a chore, you use your existing horn circuit and run that to a 30A relay and then to the horn. It will come with a wiring kit or sold extra. It will bracket right up to the factory spot, but my engine guards conflicted so I moved it down to the brake reservoir bracket.
It's loud. If you have a relay and some decent gauge wire you can add another horn to the mix and make an annoying cacophony.
