The new SLS AMG is the retro-themed successor to the original 1950s-era Mercedes 300SL Gullwing. But if you're cruising around in one, you won't have to explain that to most bystanders. Thanks to its opening-upward doors, it's recognized as "the new Gullwing," not only by those who had walls of car posters and boxes of buff-book back issues, but...

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