https://www.jalopnik.com/2011-mercedes-s63-amg-whys-it-still-called-s63-5482736/
2011 Mercedes S63 AMG: Why's It Still Called S63?
Jun 18, 2013 - In pursuit of greater fuel efficiency and more power, the 2011 Mercedes S63 AMG adopts a 5.5-liter twin-turbo V8. So why the hell is it still called the S63?
2011 mercedes s63 amgstillcalled