I’m sure that a NHRA safety system could be made to fit in
place of the drivers seat. It would still remain a stock
car sense drivers safety didn’t effect the mechanics of the
car. I’m sure the bait of the question was that even by
the driver putting on a helmet and installing a 5 point
safety harness would render the car “UNstock”.
NHRA mandates a full cage if you run 10.99 or 135mph and they don’t turn corners.