Add your own car if not listed

Why not allow to add your own car it your specific car is not listed yet. This way you can enter the official specifications yourself and have the correct information. Now I have to select a car which is close in specifications and I might be feeding the system incorrect data for this specific car. I think that entering your own car with some specifications would be a much better option in that case. From that user created data it could then also be possible to automatically generate an official entry once multiple users have created this by themselves.