Unless you really need the money, I would hold onto it. Whenever I take out a radio, I save it to reinstall when I sell/trade the vehicle. It is easier to sell an aftermarket HU than a factory one. Sell or keep your nav for your next vehicle! The dealer won't give you anything more for it having an aftermarket unit in it, and if you sell it yourself, some potential buyers will shy away from it because they will assume the wiring has been tampered with.....