That I am not sure. These guys drive in such a different league from me that what yo me looks like less front and rear because of the way he was sliding the car through the turns is in all reality prolly something like 400/500 setting on aero as he only hit 311 at The Chase and 285? on the Mountain straight.
i would say , more something like 400-600 or 400-650 ...
i was using 390-520 earlier in the tt and i was truly flying on the straight but was sliding too much around the corners ... that's why i guess 400-650