Had one on my R1100GS for a few years now - great  Fitting it was a bit of a puzzle because of the limited space underneath the headlamp where the stadard horn is mounted but I managed to find a simple way to do it and have helped a few others to fit them on 1150 and 1100 GS's since. It comes with it's on relay but I just changed the spade connectors and hooked it straight up to the existing wiring and use the existing relay - no problem. I imagine if you ride in Cairo a lot and keep your thumb on the horn all the time it may not be happy for too long but for normal use it's fine and very very loud.
A lady in a Merc SLK pulled out in front of me a few months ago and got a full blast as I braked hard - I could see the blood drain from her face as she thought she was going to get crushed by a 30 ton truck
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