---
title: "BMW Is Dropping the M3 And M4’s Carbon Fiber Driveshaft for a Steel One"
description: "The carbon fiber shafts reportedly won't fit with new exhaust filters."
date: "2017-08-14"
modified: "2017-08-14"
authors:
  - name: "Chris Tsui"
    job_title: "Contributor"
    link: "https://www.thedrive.com/authors/chris-tsui"
url: "https://www.thedrive.com/article/13478/bmw-is-dropping-the-m3-and-m4s-carbon-fiber-driveshaft-for-a-steel-one"
categories:
  - "BMW News"
  - "News"
  - "News by Brand"
tags:
  - "BMW"
  - "emissions"
  - "m3"
  - "M4"
---

# BMW Is Dropping the M3 And M4’s Carbon Fiber Driveshaft for a Steel One

![](<https://www.thedrive.com/wp-content/uploads/images-by-url-td/content/2017/08/p90149341_highres_the-new-bmw-m3-sedan-e1502732934841.jpg>)
*\<em\>www.thedrive.com</em>*

New BMW M3 and M4s will be fitted with steel driveshafts instead of carbon fiber ones as a result of the German manufacturer complying with emissions regulations, according to *[Autoblog](<https://www.autoblog.com/2017/08/11/bmw-m3-and-m4-to-lose-carbon-fiber-driveshafts/>).*

Apparently, the old carbon shafts were too thick to accommodate a new particulate filter on the exhaust system. A narrower, "M-specific high-performance" steel part will take their place instead. [BMW](<https://www.thedrive.com/new-cars/13443/2017-bmw-alpina-b7-review-big-sedans-arent-supposed-to-perform-like-this>) asserts that it has engineered the steel shaft to retain the "superlative performance and handling qualities" achieved with the carbon fiber component. How true that is remains to be seen. Not only would a steel driveshaft result in a beefier curb weight, but it would also mean more direct weight for the engine to move, making it less rev-happy than before, however slightly.

We guess those who absolutely demand a woven shaft in their luxury sports sedans will just have to drive an [Alfa](<https://www.thedrive.com/watch-this/12519/watch-this-alfa-romeo-giulia-quadrifoglio-blow-through-150-mph>) from now on.

The change will reportedly affect all BMW M3 sedans and M4 coupes and convertibles produced starting this November and beyond. (Yes, that means U.S.-spec vehicles are included.) According to [*Carscoops*](<https://www.carscoops.com/2017/08/bmw-to-replace-carbon-driveshaft-in-m3.html>), however, special models such as the M4 GTS and M4 and [M3 CS](<https://www.thedrive.com/news/12662/454-hp-bmw-m3-cs-is-coming-in-2018-report-says>) are not affected.

## Author
Chris Tsui is *The Drive*'s former Reviews Editor and current freelance automotive journalist. He's based in Toronto.

### Author social links  
[Instagram](<https://www.instagram.com/cltsuii/>)