Mercedes-Benz has gone and done it, adding two more doors to the incredible AMG GT to create the AMG GT 4-Door Coupe. These types of "four-door coupes" are all the rage with automakers these days, but few, if any, are as potent as this one. In its most powerful form, the AMG GT 4-Door Coupe will produce 630 horsepower from a 4.0-liter biturbo V8. Zero to sixty miles per hour will happen in a scant 3.1 seconds, on your way to a terminal velocity of 195 mph. Pricing, unfortunately, won't be available until closer to the AMG GT 4-Door Coupe's on-sale date, which sometime in early 2019.