Today I bought a 2010 ford focus SE. I have my amp and subs from my previous grand prix, which I wired to an aftermarket head unit. I really like the focus stock unit, and don't want to mess up or modify my new car much. Can I wire the amp and subs up pretty easily to the stock unit without removing it? Also, what does audio pre wiring mean because my list of features for the car say that. I the single cd/mp3 player without sync but have the aux jack. I like the stock sound, but am so used to my kicker subs in my car. Also, if I cannot use my subs can I change the speakers pretty easily and throw some pioneers in the rear? I'm not a total noob with stereos, just am very cautious as this is my very first new car :-) thanks!