I owned a 350Z last year with navigation. I had to sell for financial reasons but that is another story. I am planning on buying a G35 in September. I have been shopping around and I wanted a 6 speed with nav. It seems they are very rare. How difficult would it be to install a factory navigation system, and can it be done? I have seen some navi units on ebay for the 350Z so could I buy one of those and just put it in a G35? Any help would be appreciated.