I'm curious why the OEM's didn't go with a four or five point harness as an upgrade from the three point. It's a lot cheaper, simpler, and more reliable than an airbag system. It's probably a lot more effective, considering NO major racing series uses airbags, but they all use five (or six) point harnesses. There is the matter of taking longer to put on and take off than a three point, but I've used a five point harness in a road car and it was still a lot quicker than donning and doffing all the proper gear for a motorcycle ride.

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.
99 Mazda Miata 183,xxx miles.