I remember seeing somewhere, in a magazine i think, a air horn that mounts behind the saddle bag? I have tried googling it with no luck.

1) Does anyone know if there is a company selling this as a kit?
2) Does anyone have this done on there bike?

 

Kuryakyn sells the 'hidden horns'. The only thing I've heard about them is that they seem to accumulate more road dirt behind the saddlebag. No idea on the quality.

http://www.kuryakyn.com/Products/4031/Hidden-Horns

 

Check out Rivco motorcycle products in Wisconsin. I have used their product for years. Not sure behind the saddlebag but they make one that bolts directly on to the horn mount. Great item and nice sales department.

 

Kuryakyn makes the "behind the saddlebag" air horn. But my understanding is that it is not really an "air" horn. It's electric.