I'm thinking about getting a trainhorn installed on my car. Suggestions?

Thanks in advance

I am just hearing train horns in the motorbikes in our place. But it's not a bad idea though to put train horn on your car. If you really want to make an impression.

To be honest, I have no idea why I want one. I recently saw a mini cooper with one, and I was blown away. To some of you that might sound crazy, but if you saw/experienced what I did... u'd be affected just like I am. Anyway... I guess no one here has ever seen or has any experience with them huh?

Really I am just looking for some advice on how big of a setup I should get... thats all.