Time to revive this thread ;-)
@Spunjer - thank you for the detailed write-up.
We just added a new 2015 EX to the family and I have a few questions:
1. Any idea how to find out whether I have 1 or 2 stock horns (other than remove the top grill cover and disconnect the horn on the top just for the sake of finding out)?
2. Isn't there a way of using a female connector at the end of the extension wire, into the original horn plug? It is a leased car and I can't mess with cutting wires.
3. Is there definitely no space to tuck the two upgraded horns on the top, perhaps between the a/c condenser and the bumper, maybe by extending a bracket a little forward and then down? Last thing I want to do is removing the bumper. Done that before in 2013 Accord and sure enough one of the clips did not survive. I hate messing with plastic parts and trims in cars.
Edit: Forgot to add - why would you want to sand the body? This could cause rust, could it not?
I have a 2015 EX. I removed the top plastic cover, A new horn did not want to fit. I removed the bolt that holds the stock horn to the bracket, I attached the ground wire and new horn bracket to that, so basically my new horn is mounted to the existing horn. I had to grab the new bracket with a pair of vice grips and pressed it against my garage floor to re-shape it. (you can use a less brute method if you prefer)
I tried to honk the horn with no horn attached on top, and there was no sound. I am assuming there is no horn under the bumper, unless the horns are connected in series (the missing horn would make an incomplete circuit.)
There was an air-horn for $80 at pep boys that would have fit, but I really did not want to pay $80 for a horn. It claims to be twice as loud as a stock horn. (seems like a baseless claim though, as I assume that not all stock horns have the same volume.(
I Decided to use one of the blue "tap in connectors to the stock wire, and since the stock horn was there, I decided to leave both plugged in. It sounds really mean.
The horn I bought, came in a two pack for $25 at Pep Boys, including the high and low, separately they are $20 each...If I ever pull the bumper and find another horn, i'll replace that with the other new one.
The horn kit: ( I pulled the red thing off to save a little space. )
The connector: ( I used a connector that was already hanging around, you might might to get one for smaller wires if you can find one )