I have a charger and the battery is in the trunk I had 2runs of wire from the alt to the trunk with fuses in between the batteries. I did 2runs of grounds off the alt bolt with a wire from the alt bolt to the engine block, and one to the factory ground under the hood.
I just brought the team v2's, and so far they are great. I'm still doing tuning and doing some adjustments. If you have proper enclosure space your going to get loud if you want lowz get the sp4.