I'm not a big stereo guy, so I can't get too specific... I'll tell you what I know about the system (all came with the car).
Factory amp is no longer in. There are two aftermarket amps (one under each seat). One is powering the subs, the other powers the rest of the speakers. All of the speakers are aftermarket, including crossovers built into the door (I found that out the hard way when the door speakers stopped working... had to rip apart all of the panels to figure it out. Crossover came unplugged).
Headunit is a Kenwood MP3 player. I hardwired my IPOD by using an aux cable. System sounds fantastic.
I'm not sure if the sub boxes are easily removeable... if they are, I'll pull them out and snap some shots. If you are REALLY serious about it, I'll try and remove it within reason (ie, if it's screwed, I'll unscrew it... if it's glued, you are out of luck
). Just let me know!