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Posaidon GT 63 RS 830+

Mercedes-AMG’s GT family is a lineup of filthy performance machines, none more imposing than the 730-horsepower GT Black Series. But before the GT Black Series arrived, the 639-horsepower AMG GT 4-Door 63 S 4MATIC+ held court as the most powerful member of the AMG GT family.

Just because that’s the case now, though, that doesn’t mean there’s no room for the four-door powerhouse to reclaim that throne with some help from the aftermarket world. Enter Posaidon.