I just picked up my 03 this week, needless to say it's GREAT Anyways, the stock audio is really really bad. I love the headunit and want to keep the in-dash changer, but can I swap out all four speakers as well as add an amp to power the speakers? That's all I really want, I don't want a new deck and don't really want a sub either. Does the stock headunit have preouts? I'm assuming so since you can get an optional factory amp/sub.