Personally, I think anyone looking at a 335 or perhaps even any 6-cylinder car would be mad not to spec the Prof nav pack. If you're buying with a view to exchanging in a few years and sticking with GFV then there is no risk.
But if you try to sell a car privately, of that level without Prof nav then i think you will struggle, without having to lower the price somewhat, as there will always be a lot of car available with that specced that you need to compete with.
As mentioned elsewhere, it's not just a Nav system.
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