"....he removed his factory seat which has the built-in roll protection."
Wrong.
The e93's roll-over protection protection is behind the rear seat headrests. Removing the front driver's seat only removes the integral seat belt system, which is why one needs a bar or harness setup. This begs the question: why a bolt in roll bar? Removing it might clear up the rear seats for use but then the driver has no seat belt.
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