PRO PAC is another good place to get the welding cable.
I got 0ga wire from HURRiCANE ELECTRONICS (summerville radioshack near 26) for about $4 a foot and relocated mine. I got 20 feet and that was more than enough. (s-10)
But I ran 4 ga in my mustang and at that time it was more than enough. Remember (I know stupid to say this) but the ground should be the same size or bigger than positive side.
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