A:Answer Hi. Good morning. You should confirm this with best buy but most likely you will need a gm (general motors) wiring harness specific to your impala, runs about $140, also a double din, dash kit, about $20, then if you are adding cameras ( I did ) whether or not both directions. Also I recommend an external antenna boost, this is for your phone or bluetooth connections, I also added this and am glad as I have not had any dropped or missed calls, at all.