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my service truck is an 06 international 4300 and has some wild sounding electric horns that look just like the factory ones, very deep, and VERY loud...
Funny this thread came up. Last night when I was changing my oil I had my keys in my pocket. I rolled over and the key hit the side bar on the creeper. It hit the lock button twice while I was removing the oil filter. My horn sounded plenty loud at the point LOL! Different scenario, I know, but that will make you mess your drawers.
One of my friends was talking about some crazy loud Hellas he wanted to put in his Chevy. I've never heard them myself though so take that with a grain of salt but it wouldn't surprise me.
Check this one out! I got it but i haven't got around to install it. It's smaller than the one Sully got and it has 139 db. This link has all the info and a sound clip.
wow i love thoses but im in canada and when i import stuff from states it cost me ALOT of $$$ ok broke fee and tx shipping...ther gonna cost me 100$+ retail price...hope some one distribute them in canada