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Speed Raycer:

mugwump:

They're allowed in Stock, as are mudflaps and other protective equipment.

 Hmmmm.... a full cage is "other" protective equipment Thanks Muggs!

Yes indeed!

The additions of protective equipment are allowed with the following exceptions:

a. The modifications must only provide protection to the car 
and/or occupants and provide no performance advantage.

b. Mud flaps may only be made of urethane and other
flexible  plastic derivatives (i.e. no carbon-Kevlar)

c. Skidplates protecting suspension and drive train components may only be made out of metal or plastic  
derivatives.

d. Driver restraints and roll cage may be added.

e. Additional or replacement hood and trunk latches are
permitted.  All latch systems must be secure.