I agree Ferraris past rigging is dissapointing, but I also do not believe there is much in it between the GT2 and 458? Throw some R compound tires on the Ferrari like the GT2 has and that should wipe out any doctoring Ferrari has done to the vehicle.
I agree with shizzle though. How the hell does the GTR throw up the lap times it does? It is heavy and underpowered compared to these cars, but consistantly betters them in lap time?