Hi i have a 2003 x with the stock cd player. I wont to add a 150 watt amp to the stock speakers and add a 12 and a amp in the back. I have read all the old post dealing with the install and undstand that i most likely dont have rca imputs. My question is what is the best way to add this speaker and amps?? should i use an fm modulater ( have read it dosent have as good of sound) or should i wire to one of the back speakers and if i do this how can i keep from having the amp on all the time? I am very confused as to how you all have done this any help would be great thanks.