I have round-abouts by my house and people pull out in front of me all the time. I hear my horns all the time.

 

your feets dirty hahhhaa

 

Not that bad, more the crappy video quality. All I did was the walking you saw in the video outside.

 

I want!!! How did you do that?!?!?!?!?

 

I thought that was cool of him to go out of his way and do that

 

He makes them!

http://www.kptechnologies.com/

 

I searched around for the loudest replacement horn that I could find, and stumbled across the Stebel Nautilus electro pneumatic air horn. This thing puts out 139 dB! How loud is 139dB you ask? A Firecracker or gunshot is ~140dB! [Source: Howstuffworks.com]

It is a compact air horn, with the twin horns attached directly to the compressor. Very popular with the motorcycle crowd.

Online retailer Twisted Throttle and various eBay merchants stock it.
http://www.twistedthrottle.com/trade/productview/2137/

It's very compact and fits easily behind the grill. I wish I bought two!

I had a local stereo shop install it for ~$30.

A comparison between a stock horn and the Stebel Nautilus Compact can be found here:
LINK

I'm very pleased and use it almost everyday!

My stock alarm no longer beeps to indicate it is armed, however, the parking lights still blink.

When the alarm is triggered all hell breaks loose!

 

yea alot of the guys on the miata forums have the stebel nautilus horn...i'm gonna put one in my girfriend's 06 mx-5

 

A friend of mine put one of those on his bike. It sounds good and is about the same volume as my horns.

139dB is a measurement used for sound but it is pressure based so if you are right at the outlet of the horn it will be that loud. It was much louder than mine in person. I was thinking about adding one to what I currently have.

 

hah my system in my car is still louder 144dB with the mic hanging from my rear view miror.

 

OK...