yes it is

I'm guessing you have press in studs. You can either have them machined for screw in studs or there is a quick and dirty kit that involves drilling through the sidewall of the hole and the stud and inserting a roll pin. Most performance places like Summit and Jeg's sell them.

wheel studs? head studs?

Character studs allows you to get studs every time you defeat an enemy, such as a policeman or a joker henchman.

Green studs are on the slip loads. Entrance & Exits

Red studs are on hard shoulder.

White studs between lanes

Amber studs at central reservation.