Installed my Stebel on my SWM rack today. Cut a piece of aluminum stock to size, then attached it to the back side of the rack using the two bolts that retain the wedge-shaped Givi adapter. Bolted the horn to the inside of this, and ran the wires up the rack tubes then under the seat, where I mounted the relay to one of the tool kit retaining brackets. Fired it up, and it quickly shut up the group of teenagers making a racket out in front of my house. Paid for itself right then and there! This thing is seriously intense.