Hi David,
I just saw your write up about he 4 car horns. I finished my install last night...not knowing you had done this already. Mine sound great, but they aren't as loud as I remember them being in my grandfathers 1984 Buick Park Avenue. Question I used the stock horn wires. There were black wires and other colored wire going to each stock speaker (I used the color ones not the black). If I had hooked up the ground wires to these horns they wouldn't work correct (black wires)? I used the other colored wires instead of the black. I also used 2 relays so they would get the maximum power to them. I used 14 gauge wires as well. Just curious if your horn is loud. I don't hear them too loud on the car when I blow the horn.