One of the current BMW M3 and M4's most distinctive features is their carbon fiber driveshafts. Sadly, the two BMW performance cars will become a little more mundane in the future, as the company announced it will transition the cars to steel driveshafts. The reason has to do with emissions.

BMW will begin adding a particulate filter to the exhaust system at some point in the future to stay compliant with stiffening emissions regulations. Carbon fiber driveshafts have a larger diameter and therefore take up too much space under the car. The "M-specific high-performance" steel driveshaft being used in its place is narrower enough to work.





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