Roger,

I think I may have emailed you in the past.

1) You can add a sub, just disconnect the so-called subs that are in the factory locations. They are the culprit of that mid-bass CRAPPY NOISE they put out.

2) Good idea. 6 1/2" or 7" will work in the front (I used Focal 165V which have a 7" mid/woofer). 4 or 5 1/4" will work in the rear doors. (I used tiny 4" Focals because I never actually have them on)

3) Your factory amp is right behind the driver side rear wheel well. You will have to remove the trunk liner to get to it. Not too hard to get out.

4) Highly recommended. If you want something closer to "stock looking" with better performance than Alpine, check out the Nakamichi Head Units. The 45z gives you changer control, aux input if you ever want to add video, and 20 bit DAC that is difficult to find in any unit under $500.

Romoving the rear deck is incredibly difficult. I tried myself and gave up, going a different route (I am very happy with the results). If you really want to change the rear deck speakers, go to your dealer and have them do it or have them show you how to do it yourself. Mine is very cooperative and yours should be too.

Good Luck!
Matt