11.49 and quicker you need a roll bar - minimun 6 point
9.99 and quicker you need a roll cage - minimum 10 point
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Depending on if you plan on racing on a weekly basis, or if your just gonna go screw around on test and tune nights you can bend the rules to a point. If you come on a friday night where we bracket race under IHRA rules they may not even let you run if you dont pass tech inspection.
If you put a 6point in the car and you just go on a test and tune day, track rental or ametuer night for example, and you run high 9s? i’m guess they wont bother you, maybe just a warning. If you are running mid 9s or faster i’d expect them to boot you. Its for your own safety, going fast ain’t cheap! If it were me i’d build it for the rules if you wanna race period, your choice.