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hah yeah i did have an air compresser with a train horn on it, but they don't work so well after you take them under water i would not buy another one and have not bought another one since i broke the first one
ive got regular sounding air horns on mine now, small compressor, doesnt sound to bad, similiar to a dumptruck. but just bought a set from trainhorn.org. supposedly pretty loud, 175db. 1.7gallon tank which will get mounted in the bed , then the compressor behind the seat in the cab and the horns which theres 3 of them, theyll go under the hood somewhere
i have on my truck just a pair of air horns off an old mack truck that are loud as hell. The way its setup right now is behind the front bumber is the horns then just some air line going to a basic manual air switch then to a 2.5 gallon tank i mounted in behind the front seat. I just refill the tank every so often i dont use it that much but i did pick up a little 12v electric air compressor that oughta be perfect for filling it up on the go. You can have a pretty damn loud horn pretty cheap and its pretty easy to do. Well worth it when finished.