RKP Carbon Rear Diffuser 2x2 Weave - BMW M3, M4 2015-2021



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RKP Carbon Rear Diffuser 2x2 Weave - BMW M3, M4 2015-2021


While the majority of the F8X M car is stunningly muscular, the diffuser section in particular leaves something to be desired. The flat polyurethane insert installed from BMW does not match the M3/4's aerodynamically sculpted exterior, and so was the first item RKP elected to attack. In contrast, the RKP diffuser was designed with full length fins that reach all the way from the inside of the insert to their termination point at the rear of the bumper. The fins are particularly thin, and although this makes them especially difficult to manufacture, their athletic appearance is more purposeful and athletic. Unlike the BMW performance diffuser, RKP's fins extend all the way to the edge of the diffuser, giving them a much more noticeable look in all of the right areas.

The RKP M3/4 diffuser has been in development for over 3 months with a specific focus on fit and finish. After several revisions, we have carefully sculpted what we believe to be a truly perfect fitting part. This was no easy feat, as working with the complex rear bumper shape and creating a component that would be durable, strong, lightweight, and integrate perfectly with the original BMW mounting took special care and attention to detail. We are proud to say that this diffuser fits like all other RKP components- absolutely flawlessly. 


  • Light Weight
  • Carbon Fiber
  • Perfect Fitment
  • Easy to Install


  • 2015 BMW M3
  • 2016 BMW M3
  • 2017 BMW M3
  • 2018 BMW M3
  • 2019 BMW M3
  • 2015 BMW M4 
  • 2016 BMW M4 
  • 2017 BMW M4 
  • 2018 BMW M4 
  • 2019 BMW M4 


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