There didn't seem to be too much wrong with the original horns on the RH, but something a bit gruntier would always be of benefit.
I picked up a pair of Stebel TM80's on EBay from a seller in Australia called Streetfighterau
http://myworld.ebay.com.au/streetfighterau/
they cost $36
On the Victoria meet Fred demonstrated his Stebel's and, to say the least, the volume was impressive.
The horns come with optional chrome backs, plated front grills, two brackets and a relay. The chrome backs are plastic, but once on the bike can't really be seen so the plastic doesn't matter so much.
I'm no auto-electrician so a bit of reading was in order. I quickly found out that it was a terrible idea to run the horns off the original horn wires because they draw a lot more current and it is very possible that you'd burn something out or possibly start a fire in your loom. The extra work to splice in the relay seemed like it would be worthwhile.
I found a site with some really good detailed instructions and more or less followed them to a tee.
http://www.vtxoa.com/forums/showthread.php?t=2486591. I ran a 25A feed straight off the battery into my spade fusebox - 220mm.
2. From the other side of the fuse I ran a spade ended 25A line to the relay. - 680mm
3. I mounted the relay under the tank on one of the two threaded mounting holes on the XS frame that Yahmaha didn't use on the RH.
4. On the other spare mounting hole I cleaned up a spot to make a good contact to use as a grounding point for the horns.
You can see the harness in front of the reg/rec and it branches off into 2 parts to go to the horns.
5. I made up two harnesses (positive and ground). Instead of splicing together (as per the linked instructions) I ran two wires off the one large (yellow) spade connector and terminated them with standard (blue) connectors. I ran heatshrink half way along the length to keep things neat.
The ground and the positive harnesses were made of two lengths - 470mm and 530mm. This meant I could run one up each side of the frame and still have enough length on one side to feed the furthest horn.
6. I bent the supplied brackets at 90 degrees in the vice so I could have the horns facing forwards and slightly down. They are most effective if the sound is projected forward and down. It is amazing how many people seem to mount them facing sideways or straight down. The bend in the brackets was 70% along the bracket.
7. I removed the existing horns along with the mounting extension. This meant that the Stebels sat close enough to the tank/engine to not look out of place.
A press of the button suggested everything was spot on. It sounds like a truck - and that is where the benefit lies. I seriously think these things might save your life one day because they declare your presence in a way that the standard setup simply couldn't hope to match. Without more than guesstimating the improvement I would say that they are at least 2 1/2 times as loud as the standard horns.
I strongly recommend this enhancement from a safety perspective. For a very small investment you can significantly improve your ability to warn other road users of your presence.
Some photos and a video to follow.
