I bought the prius five but didn't get the Advanced Technology package. Am I basically SOL or is there anyway that I can "upgrade" the car to have that package. I had a 2008 Chrysler 300 and the there were 3 different factory head units for that car, the AM/FM/CD one, the one that had navigation, and the one that had navigation and a built in hard drive for storing your music. No matter which level car you purchased (base or the v8 SRT8) you could upgrade/downgrade to any of the head units in your own drive way. If you bought the AM/FM/CD car, you could get the Nav/HardDrive head unit on email and drop it in and it was literally plug and play. Is this the same with the Prius. I would like to upgrade to the 7 inch head unit that plays DVD. I have a feeling the cruise control and lane assist features are a little more involved and I am ok with out them, but I would love to upgrade to the heads up display. Possible?