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rear doors are not full range, basically lows and mids I believe. the front doors are full range but have high bypass and wired directly into the dash speakers. Upgrading the dash is a pain bc the stockers are 8ohm, all the aftermarket are 4 ohm or less and this makes them overly "loud" and throws the balance of the system off. you can run them off an amp or wire in a resistor or just leave them be. I did all 6 speakes, rear,front and dash with the resistor mod and it made a huge difference. I just did a 12" rear single sub and that really finished it off.
The issue with the rear speakers is if you crank them up and upgrade them the bass they put out will rattle the doors. Sound proofing helps but its still not the best option.
I wouldn't. I disconnected mine all together. You would never know my rear speakers were gone....even my rear passengers have never noticed. Put money elsewhere