I just disconnected the horns and wire the new one into the factory harness. Its all reversable 100% with no cutting or splicing into factory wire. I don't remember where I bought them, local auto parts store, and I don't remember how much. I had them laying around from when I parted out my Jeep. I am thinking of getting rid of them though. They sound different, but not as beefy as I like. I am thinking maybe going with VW Jetta horns. If you interested I sell them to you cheap. I just gotta look into the other horns before I make any promises to sell them.