Er, that's probably going to disappoint you in many ways. Looks. Sound. Life (prob won't last long)

And the wiring will be problematic (search the site and you will find how limited the factory head unit really is).

Your best bet is to read the sticky Best Bang for your Stereo Buck and install the cross over in the doors (EASY fix). This will reduce the mid-bass in your doors and let your sub woofers behind the seats really shine.

If you really want to go the subwoofer route, you're going to need a replacement head unit and would probably want to install a quality powered sub (like the Infinity Basslink for example).