On the outside, the M3 CS gets the same carbon fiber front lip, carbon rear diffuser and carbon rear spoiler as seen on the M4 CS. (bmwblog.com)
Together, the front bumper, engine undercover strake and carbon rear spoiler increase downforce, lowering the center of gravity and generating an additional 100 kg (at 300km / h) compared to the freshly updated 2014 GT - R model. (2009gtr.com)
The adaptive carbon rear spoiler on the edge of the roof enhances downforce. (carsguns.com)