This one is pretty simple. You can achieve this in one of 2 places. On the main menu, there is a slot that says "My Cars." Here you can choose from the 3 series, and it gives you an opportunity to customize the scheme on your car. Make any change, whether its the number, a color, a sponsor, the number font, or whatever pleases you. Save your progress and back out to the main menu, your cheevo should pop. You can also get this in career. Once you have finished the first sponsor race and you sign your sponsor, you should be able to sustomize your car. If you
over to the "About Me" tab. Then hit
and you can edit your car for your career season.