Did a few searches but did not find anything on this subject so I thought I would start a thread to see if anyone has upgraded the OEM chipmunk fart horns. The OEM horns have a odd one pin waterproof connector and the only plug and play solution I found is the aftermarket "sport" horn kit sold by College Hills Honda, they have the correct connectors built in and are only $15 on their website, but I wanted something louder. They also sell a wiring adapter kit that allows use of aftermarket horns with the more common spade connectors. The real limitation is in the stock wiring is that it is very thin gauge and the 10 amp horn circuit capacity. Most twin horn kits draw more than the stock circuit can handle and require a relay and higher amperage fused circuit from the battery. You can access the drivers side (left) horn from above but the passenger side (right) horn is mounted low and may require removal of the inner wheel well. I decided to use the wiring adapter lead that plugs into the OEM connector to trigger a relay for new 20 amp horn circuit using 12 gauge wire and 20A fuse holder directly to the battery. I used the accessible left side horn wire for the relay trigger and installed a Stebel Nautilus compact air horn at the left horn location. The right side horn was not touched because it was too hard to get to, and on my LX it is the horn that "chirps" when I double press my keyfob lock button. The results? Well, distracted half awake commuters will no longer ignore the polite "meep" from the stock horns as they drift into my lane, this thing will get anyone's attention, even with windows up and radio on! The pic below shows the main components but not the 12 gauge connecting wire.
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