I am looking at swapping out the factory head unit with an aftermarket pioneer deck. The problem is that this car has a "premium sound system" in it. All of the research I have done and has said that the deck can only be put in if the entire system is replaced i.e. the speakers and external amp. This claim is made because of the amplifier in the trunk in the car. The wiring harness that I’ve looked at for these cars does not look like the one that is behind my deck. Best buy looked at it and said that they would have to probably replace all of the speakers because of the amp, they didn't think a new deck could be intergraded into the speakers that are already there. If any one has any experience about this and knows an easy way out that I can do to get an aftermarket deck in without replacing the whole system I would really appreciate your help.