I remember that there was a few laws that were purposed for the books a few years ago limiting 115dB's as the loudest you can have a horn on a passenger car. I am wondering if that got passed (I hope not). Also, if anybody knows where to find a horn that's 130+dB's I'd would greatly appreciate it. :-)<p>Albert Ur 1.8TQ

My understanding was 110db for any aftermarket noise maker, i.e. alarm sirens, air horns, etc.. I am pretty sure it was passed, because you basically can't find horns or sirens louder than that threshold these days. Something european perhaps is in order.<p>Michael<br>

I think mercedes horns are 115 or greater? They are supposed to be at a dB which is most noticable or something like that?<p>Dmak

I'm ashamed to use the horn on my A4 - afraid the guy I'm blowing at may laugh. I am definitely going to search some junkyards for a '76 Granada horn. Maybe then I can wake-up a few morons around here.

California Motor Vehicle Code sez:<br>27000. (a) Every motor vehicle, when operated upon a highway, shall<br>be equipped with a horn in good working order and capable of<br>emitting sound audible under normal conditions from a distance of not<br>less than 200 feet, but no horn shall emit an unreasonably loud or<br>harsh sound. An authorized emergency vehicle may be equipped with,<br>and use in conjunction with the siren on that vehicle, an air horn<br>which emits sounds that do not comply with the requirements of this<br>section.<p>So looks like it is not a set number...

I saw this "back on the farm" in high school. Crafty devils wired a 6V unit up to a K-car. The result was a loud, scary, metallic noise. Probably shortens the MTBF a bit, but think of it as a "chipped" horn.<p>What uses a 6V horn? Old VWs? Horns designed for use in series? Tractors?<p>BTW, Definitely run a fast-acting fuse inline when doing stuff like this...<p>AJL<br>98 Passat, wimpy horn

My Clifford air horns to supplement the alarm on the Celica I had in college were 130db, but eventually wore out. I met someone who had put a train horn in the bed of his pickup, and while I don't know if that was legal, I would bet it was in the 145-150db range--that's loud. Sometimes I really wish I had some of those; giving some jerk in the fast lane or the right-on-red is o.k. lane some sort of heart failure for failure to move would be kinda' neat.