I would suggest that you run another 4 gauge cable, one for each amp especially if you are most likely placing the amps in the hatch area behind the rear seats. Those amps are going to need a lot of current from the battery for you to run them how the meant to be. I would also suggest that you replace your ground wire from your battery to your chassis. On a stock Teg the wire is too small for this kind of system. Just get a 4 gauge or 2 gauge chunk and replace it. You only need about a foot or less. This will also help with the current draw.