You can buy a zillion horns and they'll all sound like a rooster with his neck in a strangle hold if you're using the stock wiring. To get the sound (even the stocker) where it belongs get an Eastern Beaver horn relay kit. You'll get all 12 volts if you aren't moving and just over 14 if you are (the ole charging system should be working), since it hooks the horn directly to the battery (the OEM button actuates the relay).
My 2 pennies. (and I have 2 horns + the OEM)