Very few 82 GNs were turbo, around 35. Not enough to matter, but they existed.
So says b4black, who himself owns two, and says:
"Production figures for the Grand National Sport Coupe were not kept, so the actual number is unknown. The commonly reported figure of 16 was an approximation that incorrectly became accepted as fact. I have seen a wide range of numbers quoted, but none ever have references to their origin."
Thanks for reminding me. I'd forgotten. They're forgettable.