Air horns (the kind you're talking about) are kind of a pain because they require a pretty substantial air supply for them to work. Keep your eyes peeled for a set of horns off an old 30's - 40's semi or delivery truck at swap meets. I picked up a set of two horns a year or two ago and they are plenty loud. The difference is they're electric rather than air powered. The technology of both is similar (a vibrating diaphragm attached to a horn bell), but the electric ones will work off your battery. In fact, a lot of the older ones are 6 volt, so they are even louder when you power them via 12 volt. There also is no lag like there is for an air horn.
I'm still on the lookout for a nice set of train horns (not much is louder than those, that's available to the public anyway), but those are BIG bucks, and not too practical for on-road use.
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