For ****s and giggles, and a stronger horn, I put in a 12volt "oogah" horn for my 2008 hatch. I laugh at the looks people give me when I hit the horn on it. It strangely enough actually works well for the car and my personality. It's also quite loud.

I admit, your setup is a lot cleaner than mine is. At somepoint I may look into fabbing a better bracket for the placement of the horn, as well as how it's plugged in. Seeing what you did with yours gives me thoughts on making a better connection for mine.