You are trying to run a 8" and a 10" sub? Word of advice if you are, just because you can does not mean that you should. Eliminate one of the subs and replace with one to match the other, then one amp to run both. (saves you a big 0 gauge wire kit as well).

 

Scratch that plan. I have a single 12 now. lol

 

Here's the link for wire size with amperage.

Canadian Car Audio - Recommended Power and Ground Cable Sizes

 

My system is already done :P