Some cars are made “bad,” souped up by their owners, and some are built “bad.” The latter is the case for John Pritchard’s very rare ’87 Buick GNX. Don’t feel ignorant if you’ve never heard of a Buick GNX. They were a one-year-only model, and only 547 were made. And 1987 was not exactly a banner year for performance cars, which makes John’s hot GNX even rarer. In fact, the online GNX Registry shows only three in all of California, making it ultra-rare. John had once owned a turbo-charged ’87 Buick Grand National (a GNX is the extreme sports version) …