A bit of clarification gentlemen.
The 986/996 and 987/997 are no more likely to overheat on a racetrack than the venerable Turbo or GT3. Actually due to a flaw in the GT1 engine variant, the Turbo/GT3 are MORE likely to overheat, with failed coolant line connectors that have dumped coolant on the rear wheels causing spin and loss of control. There is a $3000 fix available... engine-out of course:
The GT1 Coolant Pipe Prevention / Fix on GT1 block (GT3, GT2, Turbo) Cars - SharkWerks Porsche Project Gallery
Carry on.
