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"they do have their own standards of testing and such (FIA)"
FIA cages are of a much higher standard than SCCA. That cusco cage would not be legal for either. There is no way that A pillar bar would survive a rollover. I think that cage is designed to provide chassis stiffness more than anything. Cusco calls it a roll bar and that is what it is. I like it though, just not going to survive much of a heavy roll.
This Corolla has a 18 pt WRC cage. It rolled 8 times flat out in 6th gear at over 120 mph. If you build your own cage model it after a modern Grp A, Grp N or WRC rallycar cage. Chassis stiffness and safety are unparallel in their design requirements.
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