Haha, when the horn died on my 1989 ford festiva (my first car) my buddy installed one of those in my car as a joke without me knowing. Imagine my surprise when I used the horn the next time. They are VERY loud, especially for a tiny car like a festiva.
That is the shit...if I had some extra flow to piss away right now I'd get it for the GTI. I loved the DOH! On my beetle I had a bull horn with crazy sounds like animals, sirens and a mic. Me and my bro used to drive around and everyone would stare at the car because is a loud old beetle then they we would we would make fun of them. So stupid but yet so great.