I'd agree with Al, pretensioners should be standard and what's also a con is that it looks like US cars do get these bits as standard.
BMW restraint system (UK version)
...for the driver and front passenger, comprises three-point seat belts combined with integral tensioners and force limiters. So in the event of a collision, passengers are held safely in their seats. The seat belt buckles in the rear are coded to avoid them being incorrectly fastened.
BMW restraint system (US version)
...for the driver and front passenger combines three-point safety-belts, automatic safety-belt pretensioners, seat bolsters that help prevent occupants from sliding forward, and Active Head Restraints. The system helps provide optimum restraint in a collision.
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