Using SIRs to force more cars in S is just clear justification for why we need a class above S.
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There it is, plain and simple. But wait, those 190-225 won't get classified because they are outside the performance envelope of ITS, and they won't use SIRs as part of the classification process. Becomes a self-fulfilling prophecy

Joe,

Right now, today, SIR technology has no place in IT. Create ITR (or ITU or ITF or IT#$$*(&&)_#$*(_@!&( for all that matter). Set the #/hp ratio at something around 10.5, and go for it. BTW, that puts an E36 making 250 crank hp at 2625#. It also puts something that makes ~300 crank hp @ ~2850#. That should keep the tire and brake wear in a reasonable range. Give them up to 17x8 wheels and be done w/ it.

One more thing, put a 3000# limit on the class. If your car would weigh more than that, based on the process, pick another horse.