I've only seen 2 in real life. There were only 117 made for a reason. Too sporty looking for Buick Drivers, too slow for 0.6% of Buick buyers that were"performance Buick" buyers in 1986.
In 1986, only old guys went to Buick Dealerships.
It wasn't until it was too late to order an '86 GN that anyone knew they were fast. We saw Muscle Car review shootout with Buick Engineers Running high 13's in fall of '85, but nobody but old guys believed it was real, at the time. V6's running 13 second 1/4's didn't add up
In February of '86, the Aprill Car and Driver came out with a GN running 13.9. In March of '86, the Hot Rod Magazine came out with a Stock GN running 12.9's with an NOS nitrous kit, and the rest is history.