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[TD]You will appreciate the difference in the sound. :thumbup: I also have a 2013 RTL and added a Wolo Bad Boy air horn, which is the same as the Stebel. We mounted it in the same location as the original horn behind the left front panel under the fog light area. There is a hole in that area that goes down into the airway for the horn to stick through. We had to enlarge the hole to accommodate the larger horn, but it fit securely up in that space.
IMO, you are wise to use the wiring harness with the relay. After checking the 2013 electrical schematics, I discovered that there are several different accessories running off the same fuse as the horn, including the heated hand grips, heated passenger grips, and the fog lights. So I used the original horn button wires to operate a relay, and took the power for the horn right off the battery buss. (Click on the thumbnail attachment below for the wiring diagram I used.)
With the new horn in place, the only way to see it, without removing panels, is to shine a flashlight up the Spyder's left "nostril" and you can see it up there in front of the upper suspension arm and shock absorber. That's how I shot the flash picture below.[/TD]
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