S/C vs. S/G

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There was some discussion a while back where people voiced they did not feel that the S/ST 10.90 racers were treated the same as the other classes.

Besides the different car requirements, and 1 second different index, what is the difference in running a S/G car vs. a S/C car as far as the divisional/national events.... is S/G a red headed step child like S/ST or ???