LfiveohX - go to californiaspeedway.com and click on street legal rules. They say:
Roll Bars & Cages: Roll bar required in any vehicle running between 10:00 and 11:99 E.T. (convertibles between 11:00 and 13:99). Roll cage required in any vehicle faster than 9.99 (convertibles quicker than 10.99). Roll bar / cage structures must meet minimum NHRA standards as found in the 1999 rulebook.
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