i think the ecu rule analogy is perfect.
the starting point can be that you can use whatever you want as long as it fits within the confines of the OEM unit.
.....so the material of construction can be whatever as long as it is inside "the confines" of the OEM mount.
and then it can build from there to be "unrestricted" and turn into strut tower bracing, etc.
1985 CRX Si competed in Solo II: AS, CS, DS, GS
1986 CRX Si competed in: SCCA Solo II CSP, SCCA ITA, SCCA ITB, NASA H5
1988 CRX Si competed in ITA & STL
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