So you are basically saying it is unlikely the STAC would consider allowing the ITR 8 to run in STL? It seems reasonable as the ITR 8 would be like limited-prep STL so it should be able to run lighter; it would have no aero, worse suspension and gearing, etc. The brakes would be larger but stock, not aftermarket like the STL car runs. The tires could be a bit larger too, but not much over the STL 225 so the advantage would be minimal.