A custom horn would be nice-
How to install it-
http://www.tuneshops.org/index~metho...icle_id~28.htm
Here is an example PIAA horn that fits the civic about $46-50.
http://www.eautoworks.com/html/searc...~Cars~Horn.htm
Demand to be noticed while you're driving your ride.
Tough-as-nails, compactly designed car horn can get you the attention you need. No matter if you are trying to avoid an accident or get some attention, this durable all-weather PIAA car horn upgrade can get you the awareness you need, even if you are in a noisy environment.
Get this Honda Civic PIAA car horn and get the attention you need today.
PIAA automotive sport horn for Honda Civic - 400hz/500hz 115db
Get the PIAA high performance automotive horn upgrade / horn replacement. Compact and lightweight design to fit your Civic. High performance car horn rated at 400hz/500hz 115db will surely get you all the attention you ever wanted. The PIAA sports horn can be easily installed on your Honda Civic. These car horns are all-weather shielded for protection from water, snow, dust, and dirt. The PIAA automotive horn system comes complete with one each of the 400hz/500hz 115db horns and installation instructions.
PIAA car horn for Honda Civic Features:
-- Getting attention around you.
-- 2 car horns included 400hz/500hz 115db
-- Powerful 400hz/500hz 115db dual tone.
-- All weather resistant cover.
-- Easy Installation.
-- Super lightweight.
Didn't see one for the FIT. But the two models look like they generically fit many of the Hondas.
Or if this horn is too mundane then try-
http://www.lacosamojada.com/
Maybe try the custom install by Janice but it won't be cheap.