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Originally Posted by freebeard
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That thing's cool.
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As for the roll bar question; pick a racing class that reflects your level of seriousness and look to their published specs.
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Those are probably all based on wearing helmets. I'm concerned about the safe distance between the human head and the car's structure. Maybe I'm overly concerned about a roll bar versus the doors and A pillars being just as risky. The other thing I think about with respect to homebuilts is crumple zones.