[TigerDave]

Originally Posted by Blurry

Here is the air horn I had in my 02 Focus SVT and I just purchased one for the Si...
http://www.thompson-automotive.com/Air_Horn.html

That is the same one that bought earlier this week (but haven't installed yet).

You can also find it here (where I first learned of its existence):
http://www.griotsgarage.com/catalog.jsp?&SKU=77505

and here:
http://www.wolo-mfg.com/air.htm

the latter of which I bought (on eBay).

Will post pics of the install when I actually have the time to do it.