If you have a junkyard near you try to find one for an Accord or Odyssey. OR you can just order one from Majestic Honda for about 28 bucks.

Your horn sucks? That's your first problem.

Horns are supposed to blow.

The Metro could use a new horn. It sounds like a clown car.

do you guys have a ahrbor freight near you? if you do they have some pretty cheap airhorns/regular electronic horns i think thier like 130 somehitng db

Just go to your parts store and get a low and high tone horns and wire them in. I put a low tone on my 06 civic soon as I got it home.

I REALLY would love to put a train horn on my car like in that youtube video. They're just so damn expensive.

Old siren/horn
 

If you can find an old electronic police or fire siren -- they almost always come with a "Horn" feature (watch the show COPS or listen the next time a similar vehicle passes and you'll hear what I mean).

I had one wired into the horn button when I ran volunteer Fire/EMS. Basically it consisted of a control unit (including a knob for selecting different siren tones), wiring (you could setup an easy push-button, or wire up a horn switch relay if the unit is equipped), and a speaker (I used a 100-Watt variety with a large bell housing). It's been a while, but I bet the old stuff can go pretty cheap on eBay. Of course, you'd have to disable the sirens or expect some trouble. :rolleyes:

As far as effectiveness, it was loud and different enough to get the attention you needed. Not sure about the laws of its use in CA.

RH77

my air horns I got for $59 from https://stores.ebay.com/Siege-Engineering-Equipment they were called hammer3

I used an old aluminum fire extinguisher for the air tank and a heavy duty truck tire pump from harbor freight for $39 on sale. I used a few fittings and hoses from the hardware store to tie it all together with a 150psi pressure regulator from the same hardware store.

I have less than $150 total in it. I used a smaller sized fire extinguisher tank that fit in the front bumper and is very quick to fill up from empty so the compressor doesn't stay on for long. It is a pretty nice setup and nobody can ever say they don't hear my horn anymore :D

Coyote X - the sound clip for the Hammer 4 is amazing! Would you say yours sounds like a train? With that size tank, how long can you sustain the horn?

My stock horns took a crap on me, couldn't make a peep. So I got a couple of horns from JC Whitney (jcwhitney.com). They have a good selection. I settled on one 130db hi tone and one 130db low tone, part #'s MR710714 and MR710716 for $14 each. The two different tones compliment each other well, and it's much louder than stock. They also fit like stock and are easy to wire in. They also list a 140db horn, train horn, ocean liner horn, air horns, and novelty horns!