Hey people... I have a 2004 camry sportivo and want to add a subwoofer to my stereo, i have the amp, and i have the sub... but when i went into alberts they asked me all these questions about the back of my head unit... like does it have rca out-puts and other questions that i kinda had no idea of... does anyone know if the stock head unit is capable of attaching an amp and sub to it, and if so is there anything i need to know before i go to someone and get it installed?? Thanks Heaps!!