If I were to do it again, I would buy the horn itself and get the tank & compressor separate. The compressor/tank that comes with the "complete kit" kinda sucks. Its noisy, like one of those portable compressors that plug into a cigarette lighter.
The compressor with pressure swich cost me $160. Its a Viair 280C. Much quieter and has rubber mounts. It also has a remote air intake and filter.
The tank was $42 here:
http://www.truckspring.com/airspring...oduct/9127.asp I got the 3 port but ended up plugging the center one. So figure on $200 for the tank & compressor.
I bought some angle iron and added to the mounting bracket. I have it attached to the firewall with 2 self tapping screws. The horn juuuust fits in there so even if it came loose it wouldnt go anywhere. Its that close.
The compressor & tank are in the jack compartment in the bed. There's no way the tank is fitting under the hood. The compressor probably could, but I wanted them close to one another. There appears to be room to mount everything under the truck just above the rear axle, but take some measurements beforehand to be sure.
I'd say they are very close to a train horn. They don't pack the same punch as a real locomotive horn, but the sound & tone is defintely there. The real ones have a large diameter feed and use a ****load of air. Way more than would be practical to get working on an H2. BIG tank, etc.
They are definitely loud though and the fun factor is high.
