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Inform them of your presence with this horn and they'll probably ruin their shorts as they drive off the road..
I've seriously considered getting some kind of air horn for my sporty. One of my friends has one, and OMG is it loud! Even when you're standing next to him and know he's gonna blow it, you still jump.
On topic: My bike came from the dealers with Vance and Hines. It has a good sound, but frankly, I'd be just as happy with a little less volume. I have seen people take note when in traffic from the sound when it was obvious they'd not seen me, so I'm not complaining. When I upgrade, I'll probably get something a bit quieter so I can more easily listen to tunes while riding the countryside.