TrackBattle Overfenders Question

Hi everyone,

I'm posting this to maybe get one of my concerns answered. I'm planning on setting up my RSX Type S for Street class but as I'm reading through the rulebook it states that all oem fenders must remain original material. Maybe I'm reading too deep into this but does that mean I can't run a overfender in the rear of my car? or does that mean the rear quarter must still be the same as oem?

If anyone could help that would be greatly appreciated