Since the McLaren F1 was actually detuned in racing trim (by about 100hp if I remember), why not keep it dead simple:
Rule 1 : mininum 50 road cars
Rule 2 : only mods allowed are roll-cage, racing seat & removal of any creature comforts.
Maybe have a second class, for cars that were slower but increase the minimum number of road cars.
Run them on slicks and they would be pretty fast, not to mention the fact that you could actually buy one for the street!
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