I'm assuming this is a hypothetical question but I see this type of question on here quite frequently. Why would a guy have to choose between a car and a girl. What is the problem with having both? If the problem is that the girl wants you to get rid of the Z (RX7, Supra, insert car of choice here), then you guys are hooking up with the wrong type of girl. I will say the same thing I always say in response to this question: your happiness should be the most important thing to her, if your car makes you happy, then it should not even be an issue. It's your car. If she doesn't like it, then she need to buy something that she likes for herself. That's my $.02.