German automobile manufacturer Mercedes-Benz recently unveiled its new four-dour coupe – the 2011 Mercedes-Benz CLS. The Mercedes CLS as a four-door coupe concept is relatively new, as Mercedes-Benz introduced the CLS in 2004 that made other luxury car makers emulating the design.The next generation 2011 Mercedes-Benz CLS’s four-seat arrangement extends the full length of the cabin.