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I have a couple of options, leave the car in the stock, factory configuration (stock seats, 3 point belts). Or install a DAS roll bar that will bolt in for track use only along with 5 point harnesses
It seems that the your safest second option should be a Roll Bar and a 6 ( not 5 ) point harness. Here the technical support:
Excellent post and info, thanks! I too was at the described presentation, but this does a much better job than I've ever been able to in documenting the presentation.