I dont have any pictures at the moment, but I recently upgraded my base stereo with the following:

Fronts: Infinity Reference 6.5" components, tweeter in factory mid position, crossover in door handle
Rears: Factory speakers, unamplified
Subwoofer: Arc Audio 10" KS10D2 in custom built box
Amp: Arc Audio KS300.4 (2x90w front + 2ch bridged @ 350w for sub)
LOC/Processing: Audio Control LC6i, with ACR-1 bass control ****

I took the signals from the X9331 harness, and I ran all new speaker wires between the front components and the amp (a PITA but worth it).
I used 4ga power from the battery to the amp, and a 4ga ground from the amp to a factory ground beneath the passenger door sill.

I was going for more of a SQ system and I have to say that after a short bereak in the system sounds dynamite.
Sometimes the front are a little bright for me and I am considering trying maybe Alpine Type Rs in the fronts but only if I get a good price.
My sub can go from adding good sound quality fill and support to shaking the car and moving your hair.
The fronts and sub will not distort at any volume I can handle - I quit before they do!
And the unamped rear fill stock speakers seem to help although they will distort at high volume.
I am probably going to add better quality unamped rear 6x9s in the near future.

Unfortunately I dont have any pics of the install process - I wish I did - and there isnt much to see of the finished product since everything is hidden, but I learned plenty along the way if you have any questions...

Cheers

 

Pictures answer so many questions. Bring on the pix'. Thanks