I have fitted twin trumpet air powered horns on previous bikes but noticed that other road users looked for a car, rather than bike, when I used them. For this reason (and lack of space) I've decided to fit a pair of electric (Lo+Hi note) horns. They draw a substantial current but the wiring is straighforward - fused feed from the battery and a relay piggy-backed onto the existing horn wiring solves that. You can buy them from Halfords or most car part places complete with short brackets and a relay. I think M+P and MPS stock them as well. All you need add is the wire, fuse and holder, crimp connectors and cable ties. The bracketry probably requires patience to achieve a neat job, you could anticipate fitting additional lights when making the bracket. The brackets in the kit won't be big enough for this purpose, so consider using aluminum strip from your local DIY shed. IIRC £20 should cover most of the costs. Regarding location; Paul suggests under the beak, this is where I had thought of fitting them but I have not investigated yet. If I get round to doing it I may post a photo if anyone can tell me where to post it. Rgds Richard