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Message: [QUOTE="Snake, post: 811780, member: 97"] [I]One of my all time favorite mods. Completed in 2006[/I] Before I even made my first payment, some goofwad backed out of a parking space and hit me while I was stopped. Only damage was a nick in my rim. He said he didn't hear my horn, so I looked for the loudest thing I could bolt to the truck. [B]Nathan K3HA[/B] [ATTACH=full]118845[/ATTACH] I realized that they'd have to be modded in order to fit without losing my spare tire, and I began researching again. Eventually I ended up fabricating some custom brackets that allowed me to eliminate the manifold for the train horn. It also allowed me to run 1/2" line all the way to the bell's diaphragm. :evil No way to mount the NPT fittings to the bell [ATTACH=full]118846[/ATTACH] My solution? Tap and thread a 1/2" thick piece of billet aluminum for the fitting, then drill two more holes so everything can be bolted together. [ATTACH=full]118847[/ATTACH] Fabrication and test fitting the brackets....... [ATTACH=full]118848[/ATTACH] [ATTACH=full]118849[/ATTACH] [ATTACH=full]118850[/ATTACH] Completed all my mock-up's then primed and painted everything. [ATTACH=full]118851[/ATTACH] [ATTACH=full]118852[/ATTACH] Reassembly [ATTACH=full]118853[/ATTACH] I chose a Viair 480C as the compressor to fill the 5 gallon tank. It's good for 200 psi and it's 100% duty cycle. [ATTACH=full]118854[/ATTACH] How to get air from one solenoid valve to three bells simultaneously [ATTACH=full]118855[/ATTACH] Installed pics [ATTACH=full]118856[/ATTACH] [ATTACH=full]118857[/ATTACH] [ATTACH=full]118858[/ATTACH] [ATTACH=full]118859[/ATTACH] [ATTACH=full]118860[/ATTACH] Air lines plumbed in. [ATTACH=full]118861[/ATTACH] Yes. They're loud. And they also have a quick connect for an air line. I ended up having to relocate pretty much everything when the lift kit was installed, which sucked. But the tank and the compressor now reside where the spare used to be. On something custom, of course. The compressor was wired in so Upfitter #4 works as the trigger wire for the pressure switch. This gives me the capability of turning the compressor off even if the tank pressure is below the switch's min number. Upfitter #3 arms the solenoid valve. This allows me to use the horn button in my steering wheel for both the OEM horn and the Nathans. . [/QUOTE]