Here is a few pics of my nathan P3 and setup after finally getting around to cleanin up all the wiring and getting it closer to how i want it. Still want to chang up how the horn is mounted but may wait until i get a new K3 next month.
Ugh paint those bad boys! Lol…
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Im fixing to buy a k3 so im going to re sand blast them when i take em off and i may paint em not sure yet.
You put your compressors inside the cab? Dear god that must be a biyatch. Mine vibrate the entire truck and hum as I’m driving down the road, and they are in the very back mounted inside the rear bumper frame.
a P3 is what I wanted based on the videos/sounds I heard online, but I had to settle for a K3 due to space. I’d kill to have that much room under my truck…but I’m a SWB suv lowered so I guess it’s the opposite of your LWB raised pickup haha.
Its really not that to loud when driving down the highway. My backseat muffles alot of the sound. And my stereo can mute it out pretty well
Nice install…get us some video!
I fit P3’s with a 5 gallon tank and everything else under my Trailblazer. You just need to get creative. 
I’m not sure how much more creative I could have been with the space at hand. I simply do not have 30 inches of forward clearance to mount the longest of the P3 horns (the number 1 I think is the longest and hornblasters shows the total length to be 30" or more IIRC).
http://www.trainhornforums.com/showthread.php?t=4958
I didnt want the horns behind me, and I didnt want them pointed to the side.