Ive only raced against Race Zondas, but I do not do this race very often. Try entering the race, start the race and then exit the race. Then re-enter the race and see if the AI entry changes.
I firmly believed that the AI in the MX5 indurance race was always one 1.8i, one i.8RS and three MX5 older models and this never changed. However last night I was prooved wrong.
I started the race without qualifying and then decided to try qualify, I exited the race and then rentered. The Field had now changed to 1.8i, 2 1.8RS and 2 old MX5.
This happened again after repeating the procedure.
We knew the field changed for other mixed entry races but it may also effect 1 make races etc.