On the Volusia/C50s there is enough room under the right side painted cover to mount 2 Freeway Blaster horns and a relay to fire them. Not sure if it will work on the S50 but I think it will work for the M50s.
Here is a doc that I made for doing it.....
http://webpages.charter.net/v0lusia/Installing louder horns.pdf
My vol now sounds like a truck rather than a road runner beep-beep
Here is a doc that I made for doing it.....
http://webpages.charter.net/v0lusia/Installing louder horns.pdf
My vol now sounds like a truck rather than a road runner beep-beep