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Published with permission from the Federation Internationale de l' Automobile.

ARTICLE 4: WEIGHT
4.1 Minimum weight:
The weight of the car must not be less than 605 kg at all times during the Event.
4.2 Ballast:
Ballast can be used provided it is secured in such a way that tools are required for its removal. It must be possible to fix seals if deemed necessary by the FIA technical delegate.
4.3 Adding during the race:
With the exception of fuel and compressed gases, no substance may be added to the car during the race. If it becomes necessary to replace any part of the car during the race, the new part must not weigh any more than the original part.