I got rid of the ugly *** cowbell as well. (the pic in the signature is prior to removing the cover) I re-positioned two very loud horns (high and low tone Fiamm 130 db) on the "firewall" behind the rear cylinder. This piece of metal (I call it a firewall) separates the battery compartment from the engine compartment and has holes pre-drilled in it so all you have to do is find a bolt and make sure you have clearance when mounting the horns. Then do the proper wiring and your horns will sound like a big car and just as loud.
Oh, and where the ugly *** cowbell horn cover used to be, now hangs my twin cylinder cooler designed and sold by veteran and forum member Jason Ward.