once you have the stock NAV it's expensive if you decide to change it out, you can't just change the radio part.
I would NOT get, nor did i get factory NAV, for a few reasons, i don't need it, i knew i was changing out the HU, and i plan on keeping this car, if that system ever dies off warranty it's going to be a lot more then 2k to replace it...
If it's short term and you like the look of the factory NAV get it, you can add amps speaker and sub to it with a ReQ as mentioned, or a few different peices from Audio Control, they have a new peice coming out next month that is pretty slick, and not much money.
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