I do like the idea of a train or truck horn, wanted one for years. I have had plenty of opportunities to take some, so what has held me back? Well, I know a few people who did it, and they bragged about how they scared people off the road and such, one of them got sued fot it & lost his arse. How? Well, the horns well exceed the acceptable decibel emission levels for those type of vehicles, violating the noise emission law & "creating an unsafe vehicle for other motorists and the public" as this guy found out. That slowed me down a bit on the idea, not saying I still wouldn't think of stashing one out of sight somewhere for occasional fun, but just a heads up for anyone wanting to do it.
-Chris

BTW- A 6v horn will be loud, for a short time, it will burn out if held on for too long or after several short uses. Personally I think the factory horn is fine, but I kinda like the sound of my "ooga" horns on my '37 2 ton flatbed,lol.