i agree with HS. I have the air horns on my 97....but mounted UNDER the bike...under the exhaust where you can't see them. and yes, they have saved my a$$ MANY times. I believe in them...but won't be doing them on the Rune. But they are VERY worthwhile on my Valk. Of course, i would NEVER mount them where you could see them...as they would be 'gaudy' looking
I have my dual air horns mounted in plain site on my VTX Retro 1800 and they look cool and sound great. I wouldn't mount them on the Rune, they just don't flow with the bike but lets not get personal here or I'll have to make a wave file and fix it so when you log in you'll hear those beautiful air horns every time you make a key board move...just kidding about making the wave file.
Its nice to know that you folks have opinions and aren't shy about sharing.