This how to video will explain how to install
amps more then one
battery capacitor
2nd battery
head unit "radio"
big 3 upgrade
door speakers
sub-woofer box and sub-woofer

This gets kinda complicated so you might want to take it step by step and work as neatly as possible. use different color wires if necessary. 

things you will need
car audio amps
right size wire
sub-woofer and box


Your instructable was very informative and helpful. I really don't have a lot of experience with electronics or cars but I really wanted a new system in my car. I don't know if I am doing it all quite right and I might end up having my cousin take a look at the <a href="http://audiotechnix.com/" rel="nofollow">car audio wire</a> to make sure I am doing it all right but your video has been a great help. I will have to let you know if I have any questions.