We specifically list the Spec E46 cars as eligible for STU, because the class has deviations that make them ineligible to the basic STU ruleset (weight, I think?). We added the class a couple of months ago on his request (and Eric Heinrich's lobbying).
You can do this, too, but "it's never been done" in IT. In fact, the idea has been explicitly rejected (see: Spec Miatas in ITA).
GA
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