I added the triple air horns "Train Horns" that I got from The All American Chrome Shop. I wired them so I could select just the existing two air horns or all five from a switch on the dash. The train horns were rated at 152 db. Well, they certainly were heard. After about two test air blasts, my dog wasn't happy. She was so nervous for the next few days, I never used them since. Thought I would go ahead and use them if she wasn't there, but that just never happens.
It's all fun until someone losses an ear!:B