grover is a good place to go when looking for anytype of air horn. We have their horns on or diesel spotter and they are loud. I have a set of air horns off a freightliner semi truck, and they are no where near as loud as the grover horns. I plan on using my old tank and lines with some new grover air horns on my truck. (I used to have a setup on my suburban, evryone knew when I was coming through town)
Thank you, I'm way too happy with my Duramax to even think about anything else. I work mostly on GM products, but it is good to keep informed about all makes.
If youi want real train horns check out Air Chime, they make all types of horns Ships, Trains, Emergency Sirens, Etc... They are not cheap, but if you want the real deal your gonna have to pay $$