A:AnswerYes you will need to buy the harness specific to you car. They will wire it to the harness that comes with your stereo. And you will need the replacement faceplate for your car. I bought both of mine on Amazon. The faceplate was $25 and my harness was $70 at Amazon. It you can buy them at the install from Best Buy they will cost about $99 each. However, my Amazon ($25) faceplate is a perfect color match but there are gaps around the edges that don't look great, and the harness I should have bought used. When you pay for the install the Best Buy website will tell you the EXACT parts you need for your car! Then just look for them on Amazon.