I once heard a legend/rumor that before Shelby allowed Chrysler to put hin name on the turbo Daytona and Charger, that they had to let bim also build a grocery getter hatchback sleeper, so he built a bunch of Omni GLH econoboxes. They didn't have flashy stripes or fake air scoops, only a little GLH on the rocker panel. They had the same drivetrain as the flashy ones, and performance was really close.
Shelby chuckled and said GLH means "Goes like Hell".