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So was thinking about upgrading my head unit to the display screen. As in my 2013 gti it's got a tiny screen in with the sat nav. Has anyone had experience in whether I can take that one out and put in the larger screen head unit and still have the sat nav as the one I have now goes off a disc for the maps! Sorry I don't know any of the part numbers ect

I suppose you're referring to the rns510?
Otherwise there is a whole range of aftermarket stereos and maybe a rcd330g to choose from.