Because it is a different category. it is Super Touring, not Super-Improved Touring.
you can run a lighter weight in STU because you have a two valve motor, check the gcr but i think it;s around 2425# or something like that. I think a 2500# E30 325is in STU would be a great regional STU car, unless a full tilt boogie national car and driver shows up, but you typically don't see those cars come out for regionals except for a rare occasion.
I'm very surprised more (non-miatae) ITS cars are not running at Majors and Super Tours in STU.
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