You can autocross and do high performance driving events on roadcourses with NASA Mid-Atlantic at age 17, there is just a bit of extra paperwork and you will need a parent or legal guardian present. http://www.nasaracing.net

Next HPDE, Nov 7-8 @ Summit Point's 2-mile /10-turn main circuit: https://www.nasaproracing.com/event/925

Next autocross, Nov 22 @ Virginia Motorsports Park: https://www.nasaproracing.com/event/926

For either one, all your car needs to do is pass tech inspection:

http://www.nasaproracing.com/images/..._hpde_tech.pdf

http://www.nasaproracing.com/rules/n...ASA-X_Tech.pdf

You don't even need your own helmet! C'mon out and play...