I took my 2007 JC in to Bestbuy yesterday to get an aftermarket head unit installed and they told me I needed a Can Bus adapter kit that was $150.00. I wasn't prepared to shell out an extra 200 bucks on adapters for another radio so I didn't get it. (Faceplate adapter and Antenna adapter were another 50) Does anyone know if we really need this adapter and if so is it something thats so intricate we can't build ourselves. I don't quite understand why the radio would need to talk to the engine. Thats some marvelous engineering.