I recently installed a power distributer so i could run another amplifier. Currently, it has my main 8 gauge wire splitting to 2 more 8 gauge wires. It doesnt seem like a very stable setup because every now and then, my sub will go into safe mode, or my speakers rattle when the bass hits to hard. I have a 1000 watt pioneer amp for my sub and a 250 watt amp for my rear speakers. Exactly what is required to upgrade my main 8 gauge wire to 4 gauge? 4 gauge main wire, 4 gauge ground, terminals, and a fuse block is all i can think of, any other items or precautions?