I bought this bad boy from a distributor in MI and am one of the first to get it. Since it uses its own compact compressor and I didn't know if it would sound cheesy. Well needless to say I am impressed. I can't say that it is ear deafening but it is definitely loud and sounds exactly the same tone as a tractor-trailer. Installation was easy as it comes with a relay. You just have to run a wire from the battery, through a 30 amp fuse to the relay and then from the relay to the horn. The negative on the horn is just wired to the frame. Then you cut the two wires from one of your factory horns and wire to the relay. I disabled the second horn as well because I didn't want it messing up the sound of the truck horn.