Hi, Have mark 4 with a kenwood stereo (I know, didnt have enough for a apline) anyways....I wanna know can I put a hard drive in the back of my car? I have a fli vibe amp/sub and you know when ur driving down the road and think ohh yeah that wong would be great right now!!! Wud I need to change my cd player as well it is mp3/wma?