if you running two kits you will need a realy harness and yes it will be fine with your factory wiring, but if you do use 55 watt kits then you will need realy harness so you dont burn up your facktory wires cuz 55 watt kits run very hot, and buy the way xentec are the worst hid kit you can buy, get them form ddm tuning or from vvme.