this is probably a very simple question, but i chose to create a thread just to ask anyway. Im not very familiar with my audio system, or audio systems in general, and starting to look into improving it. Decided to start with the head unit; the original owner fitted the car with an old kenwood head unit, after inspecting the head unit, i noticed the previous owner had rewired it. I found a much newer pioneer head unit with nearly the identical wiring, will i have to do anything to it based on the age difference or should i be fine?