Forget Hella Supertones, I just ordered one of these

[Splinter]

http://video.google.com/videoplay?docid ... 5122625390

Stebel Nautilus compact airhorn

Rated at 139db, instant on. (no lag)

42 bucks shipped from Cali.

Here's the NASIOC link to the guy I found out about it from:

http://forums.nasioc.com/forums/showthr ... ?t=1014647

[Subtle]

Splinter

I installed air horns a couple of years ago. Definately not that loud, but just a liitle tap on the button gives a fairly quiet note.

When hooked up, let us know if they work the same way, but with the option of the full blast.