Well the install is done we had front speakers too I was just curious about the wiring configuration for the rears because he has the 6x9s and the 4in's in the back so we hooked the 6x9s to the factory wire that was going to the 4in speakers and it sounds fine. The front speakers we replaced we just had to slightly modify the plastic bracket because the speaker was a bit larger. But all said and done even with the stock head unit it sounds great....and I'm 98 percent sure he does not have the monsoon or bose I didn't see an external amp and there isn't any indication of their name being on the system like in my 04 grand prix.