Short answer: Yes.
long answer: that and so much more.
A lot of what you can do with a car PC comes down to you. The more time, energy, and money your willing to spend, the more your likely to get out of your project, either in your final unit or in the fun you've had getting there.
Have a look around the forums, theres so much information I learn something new every time I . I would start with your make and model of car, and see what you can find.