The above car is the TK Square car from japan (quite famous BMW Racing team).
I have bee told that this car is equipped with the CSC 7 Model with 265/35-18 and 295/30-18.
I am not a big fan of the sizing.
My recommended sizing would be 265/35-18 and 295/35-18 rears. or even 275/35-18 for the front.
here is the set up on TK Square's Track M5.