150db Train horns http://www.hornblasters.com check the video's out. http://www.hornblasters.com/vide.php
that would be fun on a seperate push button, but not for a horn. could u imagine the fun you could have with them. hahahahaha......hahahaha just think of the way people would look around if you hit them for a couple of secs.
Thier was a guy with a 06sti at sog that had an airhorn under the right side of his rear bumper. Made it look like a Second muffler.