I just supercharged my car and now at the track i will be required to wear a helmet when i race. what kind of helmet do i need to buy? is there a difference between a streetbike helmet and a car helmet? because its easy for me to get a motorcycle helmet.
check the track rules, current safety certifications are required, generally those are good for ten years or so. see if they require SA#### or M####. for example, i've got a M2005 helmet. SA adds fire retardants.