So the horn that makes the beep when you lock the car on my CL is really quite quiet and I was wondering if anyone had any idea of how to swap this out and put in a different/louder sound? I tried searching, nothing really came up. I think there might be some universal horns maybe?

 

Universal horn is going to require a lot more power than the very low powered piezo electric setup in there right now. I believe it's located in the drivers side fender well.