i hear ur K5LA, a siege engineering Hammer4, and a cheap truckers stop 3 horn 
i got in a horn battle with a kid by my house he had the cheap truckers stop 3 horn and he was mad… weeks later, he finds me and what does he have… a damn leslie RS5T and honks it at me…
Hey don’t talk trash about the trucker horn. I haver the 3 chime or now as it is know as the 3500 and it is louder than my P3.
Disclaimer: Larger orphis, and 3 diaphragms per bell at 200 PSI with Heavier resistance springs…Also Grover stainless diaphragms.
the horn in that video is stock compared to yours…
LOL…
The next step is to bore and sleeve…