Action video!
https://www.youtube.com/watch?v=9tiHEp64e3M

Most of the horn upgrade threads here seem to be for a drop-in replacement with an Accord horn. From what I heard though the Accord horn isn't necessarily louder, it's just a lower pitch. So for a still-super-cheap upgrade that's quite a bit louder I got a "dual red trumpet air horn". Wolo sells a version but I got a knock-off on eBay for about $17.

I personally like the sound of the air horn, but admittedly it's not for everyone. It's probably 115-120dB and the tone just feels more powerful than stock, by far.

Parts:

• Horn, includes relay ($17)
• Spade connectors ($1-2)
• Fuse + fuse holder ($2-3)
• Ring terminals ($2)
• Wiring (I had some laying around)

Install was reasonably straightforward. I pulled off the piece above the grille (a bunch of pop-up fasteners) and the grille (two screws + fasteners). Mounted the trumpets in an 'X' to the center of the bumper with zip ties. For the compressor, I mounted that with an included L-bracket to an existing hole inside the bumper, on the battery side of the car.

I won't go into wiring (there's plenty of guides online) but I did leave the stock horn in place and connected, and simply spliced into the wire to get a control for the relay. Having a soldering iron helps. In practice the stock horn is drowned out, you can only hear it if you're specifically listening for it.

 

Nice upgrade, doesnt an air horn need a compressor and tank though? Or am i thinking of something else?

 

"Real" air horns (like truck or train horns) usually use a compressor+tank I think. The $17 one I got came with a mini compressor about the size of a toilet paper roll that pumps directly into the horns.

 

Just put a stebel on mine. Been 2 weeks and I haven't got to use it yet. Weirdly no one has cut me off