Not sure if rules have changed and Dave has been kind enough to provide a link which I don't plan on reading through so I'll just give you the short of it and hope what I say here still applies.
No cage required for time trials and stock belts are allowed unless you've begun to make changes. If you have started to make the changes a 5 point is minimum and for cars over 3000 lbs cage needs to be 1 3/4" DOM .120 wall. Be sure you read up on cage design.
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Gaetano Cosentino
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