I've had everything for awhile but I'm planning on finally installing my air horns tomorrow so I figured I'd go ahead and start a write up for them for anyone else who might be interested in an inexpensive kit.
Most kits you see are around $400 with the compressors being usually $150 or more of it.
Not being able to afford that I started putting together my own pieces minus a compressor.
I was planning on just getting a pair of old horns from my dads work but unfortunately the scrapped all of the trucks three days earlier.
I started looking around for horns, listened to alot of sound clips and found these:http://www.assuredautomotiveproducts...ACHRSK-106.htm
They have triple trumpet horn too but I liked the sound of the double trumpet better (most others the triple trumpets sound better)
It ended up working out that the brand new horns and solenoid were $50 shipped when the solenoid alone was $30.
For the air tank I was looking at 5 gallon portable tanks from Harbor Freight. Being christmas time I found a craftsman tank on sale at sears for $25.
It'll be a bit of a pain haveing to fill the tank up myself but it shouldnt be to bad. Playing around with the horns a good 15 second blast dropped the pressure from about 75psi to about 71 psi (planning on running 125psi)
My plan was to have a quick connect on the tank so I could still use the air chuck if needed. The connect leaked so that was scrapped (I keep a small portable compressor in the truck anyhow)
So maybe another $15 for a momentary push button switch, and inline fuse, 30A relay and some hose I have this: