Found something even better. There is a guy in MI who puts together kits of different horns for different sounds. This guy combined the Stebel Compact Truck horn with a Magnum Low Tone horn and sells it as a kit for $73. If I can I am going to cancel my other order and just order this one. If not, I'll just order the Magnum low tone electric horn and call it good.
Here it is:
Welcome To Stebel Engineered Sounds - Are You Man Enough To Ride With Stebel?
Here is what it sounds like:
YouTube - Big Daddy Airhorn
More of a train horn sound, just not as loud, but a lot of trucks sound like that too. I think this will work real well for the lane drifters and red light runners.