People do run 2wd's in the 4wd class at 1/10th nationals...certainly not the norm, or frequently, more likely when circumstances have lead them there so they can at least keep racing on the day....and the only rule that comes in to play then (to my knowledge) is the minimum weight rule!
Clearly there is a potential disadvantage to it, particularly in low grip scenarios, so it's far less desirable! But the gap between 2wd and 4wd performance is not what it used to be when the grip is good...
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