My new 07 Optima EX is great in most all respects... the horn however is ... shall we say.. lame.

I have a replacement set of horns I would like to install but can't find the factory horn. I found the horn for the security system which is even lamer than the regular horn if you can believe that. Why there is a seperate horn for the security system I don't understand... but there is
Any help?
Damien
2007 Kia Optima EX, 4cyl, Infinity 6 CD changer with Sub,