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I believe the Porsches are/were about 5 ft 7ins tall. Unlikely they imagined anyone more than 5 ft 9 ins. driving a 911.
Consequently if you are outside the 5 ft 3 ins - 5 ft 9 ins limits look elsewhere if you want comfort.
Incidentally, I believe the seriously ugly lines of the *** end of the Panamera was due to Dr. Wendelin Wiedeking [6 ft 3 ins] insisting that his head not touch the roof liner when sitting in the back of the Panamera. The lines of the 2017 Panamera look much better because Wendy is no longer CEO.