The first ever AMG-fettled Mercedes-Benz was a four-door car, and in the Affalterbach tuning outfit’s early days, four-door Benzes were the exclusive recipients of its ministrations. More recently, of course, AMG has visited its special brand of magic on Mercedes models of all sizes and body configurations, from the A-class subcompact to the G-wagen SUV. But to date, the purpose-built AMG models have been two-door sports cars and roadsters. We’ve known for some time—certainly since the debut of AMG’s four-door concept car at last year’s Geneva auto show—that an AMG-exclusive four-door was in the works.