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Looks like the cage did its job during the VIR crash.
I'd be very reluctant to bolt any type of bar/cage onto the car. A bolt-on cage that gets dismounted or significantly deformed during even a small scale crash might do more harm than good. Even if it doesn't go through the chassis or sever its bolts, I doubt that it would offer any significant protection in a major crash. I guess there are exceptions to this when a car is shipped from the factory with properly placed (and analyzed) and reinforced chassis locations for the connections and a tested roll bar design.
Nothing like a properly designed and welded full cage...
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