[MOSFET]

I'd upgrade to a single 4 guage wire, and buy a distro block that has at
least three 8 guage outputs for your amps.

I agree with KU40 because although you may not need 4 gauge now, you may in
the future as your system grows and you add other amps and equipment.

Sure, you might not add anything in the future, but IF YOU DO, you will be
REALLY glad you took these steps now.

MOSFET