8. Carbon Fiber Roof
For the first time in the model’s storied history, the M3 sedan will be equipped with a carbon fiber roof; a feature that has been confined to the coupe variant up until now. In the case of the M3 sedan, the carbon fiber roof help sheds 11 lbs off the body while the M4 coupe loses 13 lbs. In addition, the roof lowers the vehicle’s center of gravity helping improve driving dynamics. The dark shade of the roof also gives both models a lower-slung and more compact appearance.