There are ways to do it, but it's not very straight forward and it can be expensive. Another option that is straight forward and alot less expensive, is the FlyAudio system. It is plug and play, has far more options than the stock system, and is at a much better price point. I'd be happy to answer any questions that you have about the stock system or the FlyAudio system. Goodluck!Just wondering if a ML Nav unit will work in a non-ML non-Nav car? Tried searching but couldn't find an answer specifically covering this.