Since the stock horn is just plain sorry and mine is continually full of water from riding in the rain. It sounds about the same full of water or empty anyway. I bought a Wolo Bad Boy from Harbor Freight for $32.00 with the 20% coupon. I immediately brought it home and voided the warranty by separating the compressor from the rest of the horn. I then used a Dremel tool and reduced all the plastic to what is needed only. I went to Ace Hardware and purchased an elbow, barbed fitting, JB-weld, vinyl tubing, and a fuse holder. JB-Weld the elbows in the compressor and horn sections. Bring stock horn wires back to provided horn relay, mounted horn relay beside battery. Added fuse holder and wired it all up. I mounted the horn part behind the left side cover (Road King) but if you have cruise control it may make it more difficult. It will fit under the stock Cowbell if you desire. Easy project, relatively in-expensive and the horn is very loud. If you do not like the look of the cowbell and like myself dislike the look of visible air horns, this works. Longevity is the next question. The pictures are as it progressed and as it is mocked up.