IIRC the rule came about as a result of a driver in a Porsche club event spinning and hitting a wall backwards, whereupon his seat bracket failed in the front, leaning his seat back dramaticaly. He died of neck injuries due to the seats movement, but his heads restriction (the roll bar).

It would seem that the new rule is the result of a lesser of two evils...

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Jake Gulick
CarriageHouse Motorsports
ITA 57 RX-7
New England Region
[email protected]