Most factory wires won't properly handle enough current. A problem is adding that amp with the factory head unit, it would be difficult to wire it up properly. If you have an aftermarket head unit then just use rca cables and make sure the speakers have the right impedance rating for your amp. Running the power and rca wires on each side of the car wasn't that bad although it sounds tedious. I just had to pull the kick panels, door sill plates, and take out the rear seat.