SM and SRF mostly have their own run group.
STL, PTE, ITS, ITA, etc. you run. Have an issue with classes all of a sudden?
Rolex, Grand Am does it.
Too hard? Working traffic not part of race craft?
SCCA doesn't, NASA does with E30 and USTCC.
I discussed it over dinner.
Both club depending on region, class, track, rules followed or not, it's a pendulum on what works for you.
What do you think?
J~