The Mercedes-Benz CLS 63 AMG was the most powerful trim in the W219 CLS series from Mercedes-Benz which was in production from 2004 to 2010. The 19 inch five spoke light-alloy wheels, quad exhaust pipes, and a more aggressively styled exterior are characteristic of the CLS 63 AMG. A new version of the CLS 63 AMG for the 2011 Mercedes-Benz CLS has been in production since 2011. The W218 CLS 63 AMG is powered by a twin-turbocharged 5.5L V8 producing 11 hp more than the naturally aspirated engine of the W219.