They sell a system for doing it. It comes with a button, wires, and maybee even it's own speaker. (Not sure). My friend did it himself, and it was not too hard. Just push the button and it goes tweet tweet. I am not too crazy about it myself, (seems like a useless, cheezy mod to me), but whatever floats your boat. All it gets my attention for is so I can lower my eyes, and shake my head. You can try your local auto parts store, and if not, go to a motorsports or your prefered specialty location. If they can't help you, I would bet they can tell you who can.