The Black outlaw is amazing! I have had two different Black outlaws and both have had a fantastically loud bark that sounds very much like a real train horn. Granted this is not the real deal (get a Nathan AirChime if you want the real deal) but it sure sounds like it. It is pitched very similarly to the Nathan horns! I have installed this on a 2008 Honda fit and it fit (pun intended) perfectly underneath the drivers side headlight.
Check out some of the videos that I made with my outlaw (The first two are mine and the last is an overtime game winning goal for my college hockey team and I gave them their black outlaw)
I put one on my bike!: https://www.youtube.com/watch?v=-QPS0fjDZCI&t=37s
In my 2008 Honda Fit: https://www.youtube.com/watch?v=da16VTloWO8
My College Hockey Team's Goal Horn (GO CUW FALCONS!): https://www.youtube.com/watch?v=cb0MUNOeWzU