Thanks guys! My PowerBoard is off in the pic, so they actually get covered up a bit more when the step is up.
Not 100% sure on which horns I'm going with, maybe the Shocker XL. Might be a while though, I'm already getting close to $500 for just the air portion. I spent a little over $300 on the pair of compressors. I need to save a little cash for a programmer if they get released next week.
http://www.hornblasters.com/products...r-4-train-horn
Since you won't be filling big tires, I would go with this kit below. It's the same compressor I have and is about as fast as you get without spending a ton of money. With the 2 gallon tank you could fill air bags in no time at all.
http://www.hornblasters.com/products...train-horn-kit