I have the stock Kenwood in my 2003.5 msp. My head unit stopped working. No big deal I wanted to replace it anyway. So here is my question, Will I be able to just replace the head unit with a different one and still use all the factory speakers? I have not pulled the head unit yet, I thought I would ask first. I also want to add a 10" sub just for a little rumble. Can I use the second amp to power the sub and disconnect my factory sub? So what I want to do in a perfect world is replace the head unit and have all the factory wires work with it. And then power a sub with the factory amp. What do you guys think. Thanks for the HELP!!