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I think the difference a few years ago was tuning. Weren't all the minitwin racers, highly tuned 85-90 hp beasts? If they're running relatively stock motors, it shouldn't really cost any more than the CB500 cup. Would be shit running a stocker against heavily developed race bikes though, you've got to be able to keep up with the last 3rd of the field at least to get anything out of it.
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I think they've split the field in two now. Minitwin for as standard as it gets with very limited turning (fork internals and MC) and I think that's about it.
Supertwin let's you go all out on the engine. JHS racing had some mad specimens. 95hp motors with Ti rods and cams.
If I remember right, their bike set 120mph average at IOM.
Wonder how much cheaper it is than Minitwin?
Those CB's are not bloody common are they.