Best Horn upgrade

I run a Stebel Nautalas it is two air horns in one 1 hi and 1 low tone very compact and scares the living crap out of cager dick....s
 
I just bought a WOJO replacement horn at O'Reillys and mounted in the same place as the old horn, it is bigger and hangs down more but it is obnoxiously loud for $13 bucks.
 
I just bought a WOJO replacement horn at O'Reillys and mounted in the same place as the old horn, it is bigger and hangs down more but it is obnoxiously loud for $13 bucks.

That is what I did. I just got the one that was suppose to be the deeper sounding one.