@JasonC
Hey Jason, there are many ways to upgrade your horn.
I kept my stock beep-beep horn to use as 'Courtesy' beep. I added an air horn for use as 'Hey WTF!!' beep. These horns are available at most any automotive parts store for about $35. I've posted this several times but here is a short video of my horn comparison.
Speedster Horn.mp4 from Jim Ignacio on Vimeo.
...and here is a basic schematic for hooking up the air horn.
I hope you find this info useful!