BMW expands a carbon roof panel to more mainstream models adding this feature to the 3- and 4-Series.
It will be optionally available, at least in Europe, on gasoline turbo six-cylinder M340i xDrive / M440i xDrive, and diesel M340d xDrive / M440d xDrive.
Such a roof panel reduces weight and lowers the center of gravity, so BMW used to offer it for high-performance vehicles.
The carbon-fiber-reinforced roof panel debuted on the exclusive E46-generation M3 CSL (“Coupe Sport Lightweight”) in 2003. BMW applied it to cut the mass significantly (243 pounds in case with that car) and improve aerodynamics.
With the arrival of the E92-generation M3, the roof panel became standard on the coupe – on the models which come without an optional sunroof.
Currently, the M3, M4, M5, M8 (both Coupe and Gran Coupe have this feature.
In addition, the carbon-fiber roof is an option for the M850i xDrive (Coupe and Gran Coupe), and part of the BMW i3’s carbon fiber-reinforced plastic body cell.