2013 Mercedes-Benz SLS AMG GT

If you were Mercedes-Benz, and you wanted to breathe a few more years of life into the range-topping SLS AMG, how would you do it? You wouldn’t alter the design much, because the car’s retro-futuristic lines pay homage to the iconic 300 SL Gullwing, while delivering a presence that few other cars on the planet can match. You’d be…