According to a report from Autoblog, future models of the BMW M3 and M4 will replace their carbon fiber driveshafts with steel ones in order to comply with emissions regulations set by the German automaker.
The decision to switch stems from the old carbon driveshafts being too thick to accommodate a new particulate filter within the exhaust system. In their place, BMW will introduce a narrower “M-specific high-performance” steel shaft. The company claims that the new steel driveshaft has been designed to maintain the exceptional performance and handling characteristics previously delivered by the carbon fiber version. However, whether this assertion holds true remains uncertain. Transitioning to a steel driveshaft may lead to an increase in overall weight, potentially making the engine slightly less responsive.
For those who prioritize the use of carbon fiber in their luxury sports sedans, it seems they may need to consider alternatives like Alfa Romeo moving forward.
This modification will impact all BMW M3 sedans and M4 coupes and convertibles manufactured starting in November of this year, which includes vehicles intended for the U.S. market. Notably, as reported by Carscoops, special editions such as the M4 GTS and the M3 and M4 CS will not be subject to this change..
