Like Tirefryr said, forget the cap. It will do you no good. Invest the same amount of money on an extra battery or an upgrade for your alt (from regular to high output).
But unlike what Tirefryr said, I say go with the Knu's 1/0 wire. The hyperflex is awesome wire. You'll thank yourself over and over again if you buy that wire. It's 1/0 wire that moves like 8 gauge. It's really weired, but really cool at the same time.
PS: What Tirefryr was saying about "flash" was about a good looking install. You're going to have to read through some BS on this forum.

Sarcasm runs rampant!