The SLS AMG’s short run has run its course; and with an emphasis on fuel efficiency resulting in engine downsizing, you could be forgiven for thinking that surely this is the end for AMG’s fire-breathing 6.2-liter V-8 as we know it, too. After all, AMG’s twin-turbo 5.5-liter V-8 lies in wait, making monster power from relative sips of fuel. The Times, They Are A Changin’, you could say. Like Ron Burgundy, the skunkworks crew in charge of the SLS AMG GT has never heard that song. So as we say goodbye to the 563-hp SLS AMG, we welcome the 583-hp SLS AMG GT.