Both Porsche and Mercedes will soon have a new competitor for their four-door coupe as BMW readies its four-door coupe-like sedan. BMW new four-door luxury GT flagship, possibly called the 8-Series, will be based heavily on theBMW Concept CS and will be launched in 2010. It will compete with models like Mercedes-Benz CLS63 AMG , Porsche Panamera and Aston Martin Rapide .
The car will be built bu BMW’s M division, but will not carry a M name: “It will take a couple of years [to get the CS to market],” says BMW M president Ludwig Willisch. "The naming is not defined yet but it will not be an M car".
The 2010 8-Series will be made out of aluminum and carbon fiber to reduce weight for increased performance. One of the engine options will be a 6.0-liter V12 formed by adding two cylinders to the M5’s V10.