I have an 08 vw jetta and would like very much to hook up an amp and subs for more bass. Unfortunately my father won't allow me to replace the head unit, causing some complications. SO after some searched I found out there might be a way to hook it all up to the stock unit, with somethings called "inline converter" or something along those lines. I guess I am just ultimately confused and would like to receive some clarification to my questions. How would all this be done, where can I get a inline converter, and how well will it all work?