2008 Lancer audio wiring question

I have a 2008 Lancer GTS. I did not get the Rockford Fosgate audio upgrade. I want to install my own amplifier and speakers. Does anyone know if all of the wiring for the Rockford Fosgate system would still be pre wired in the car so that I can hook up my own system to the pre existing wires. If so where would they be located. If not, what would be the best way to hook up an amplifier in that car to the stock radio.  Thanks in advance for your help.

I doubt its prewired w/o the RF system?