Thin subwoofers?

Thin subwoofers?

I've notice on the new 2004 corollas that there is a subwoofer option. And if you go to the car customizer on this site: http://www.toyota.ca/cgi-bin/WebObj...glLLx7j2SrN6iL2M/0.15?../custom/c900000e.html and put it in, its a really thin thin sub. I have an 2003 and am looking to put something like that into my car. Are there subs like this I can buy from elsewhere or just toyota?