Steve - HateNPain is correct. I used 4 GA instead of 1/0 because my batts are, as you can see in the pics, about 3 feet from the amps. If they were 10' plus then I would have used the 1/0. I used the JL 4 GA and JL 8 GA. great wire BTW and it has 2 sleeves. At first I was WTF is this and how hard it was to cut, but once you figure it out, then it is a snap. It also made it easier to pull through the tower since the inside is rough and the outer sleeve protects the inner sleeve.
Thanks Hate on the compliments. All I have to say is Attention to Detail!!