I have the same question, I have a 2006 ES 330 I have a CD changer I'm looking to add Nav + Parking senors any idea the best route to go about this?? I'm sure I can go to the dealer ship but I have a feeling they are going to charge an arm and a leg. If I order the parts OEM is this something that I could find some one to install for a desent price? Would I save alot or should I just pay the dealership to do it? Any help would be appreciated.
I will be curious to find out more about this as well.