If i am right i think its TinCan that has one fitted to his bike a K3-4.
I fitted it to the lower radiator mount on the right side of the engine. It was just right, it felt a bit loose but that can be sorted out.
He has not yet fitted a relay but seemed to work fine.
If you are looking for a proper twin tone horn like on cars it does not sound like that. Its more like twin high tones, not high low like on the FIAMMS. There also was a small delay in it coming on, only about .5 seconds.
Rictus posted a realy easy document on how to fit the FIAMMs to the top radiator mounts, i have done it and found it easy. Being there they also are higher up away from the road crap. Also when you put the fairing on it hides the horms.
This is rictus's briliant fitting instructions.
http://www.sv650.org/docs/FIAMM%20DU...C%20HORNS2.doc