Hey Acurazine, I apologize if I am posting this in the wrong place or I made a mistake. Please let me know if this is the case.

I am fully upgrading my factory stereo on my 2003 TL Type S. I am going all new from headunit to door speakers to sub. I have a configuration Im looking at purchasing but I have a couple questions and I would love some guidance. I have never installed a stereo but I can crimp and solder and I am willing to learn everything else.

My current parts list:

Headunit (With brackets and wiring harness needed): Kenwood DPX500BT 22w RMS or Pioneer AVH-4500BT 14w RMS http://www.crutchfield.com/p_130X450...l#overview-tab or http://www.crutchfield.com/p_113DPX5...-DPX500BT.html

Front door speakers: Sony XS GT 6.5" 40w RMS http://www.crutchfield.com/p_158GT16...S-GT1638F.html

Rear door speakers: Sony XS GT 5.25" http://www.crutchfield.com/p_158GT13...S-GT1338F.html

5 Channel Amp for doors and sub: Kenwood KAC-7005PS
Sub: MTX TNE212D
Wiring: Full 4 Gage Kit
My questions:

1. How would I wire the amp? Would I run the headunit RCA to the trunk where the amp and subs would be then back up to the front then out to the door speakers?

2. Should I just get the 22w RMS output headunit and be good? Will the Sony Speakers be a worthy upgrade from the Bose?

3. Am I forgetting something? Do I NEED to get a capacitor or a second battery?

Sorry for the long post, thanks for any available help! Feel free to link me to useful threads.