As Andy said, Stephen, The STAC has decreed that they will use the 'double displacement' standard for rotaries when they class them in STL. So, a 1300cc 13B is the piston equivalent of 2.6 litres.
And STL is limited to cars less than 2.0 litres. No ITR BMW, for example, may run in any STL race.
But, a 2.0 litre ITR S2000 can run in it's IT configuration as it is 2.0 litres, but since the S2000 is on the chassis exclusion list in STL it may NOT run in STL configuration.
Follow? I missed it at first too.
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