7. 1987 Buick GNX Pre-Production Survivors
A few 1987 Buick GNX pre-production prototypes, intended only for factory testing, somehow found their way into private ownership. These rare GNXs sported experimental parts, non-standard tuning, and subtle differences from the official production models. Their unique status and the performance tweaks make them exceptionally valuable among collectors, often commanding premium prices at auction.
These elusive pre-production survivors have become legendary in the Buick community. For more on the GNX’s fascinating background, visit Hagerty.