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I didn't think it was legal to go to true coil in the rear in street prepared?
Its not. I ran stock spring perch for San Diego National Tour and through the summer but then went back to coilover early fall. I do mostly Porsche club autocrosses so no worries about being SP legal. Our Regional SCCA autocrosses are too far away so I just do San Diego and Nationals.
I'm actually considering going SSM as I'm not willing to compromise on suspension. The silly stuff that has to be done for SP turns me off as I like to run the track as well. I'm going to have nice roller bearing arms made.