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The Milltek BMW F90 M5 LCI OPF Delete Mid Section dramatically transforms the sound of your M5's 4.4l twin-turbo V8. By bypassing the factory OPFs, this mid-section offers a cost-effective way to improve your vehicle's exhaust sound.

Milltek Sport exhausts are crafted from high-quality type 304 aircraft-grade stainless steel, which is anti-magnetic and less susceptible to discolouration compared to other manufacturers' stainless steel. This premium material is used throughout the entire construction, including pipework and silencers. Mandrel bending ensures full-flow bends for improved gas flow, and Milltek Sport exhaust systems feature an increased bore for ultimate performance without sacrificing mid-range torque. Every Milltek Sport exhaust is designed, developed, and manufactured in-house in the UK.

Please note: You will need OPF delete cables or a stage 2 tune to run this mid-section.

*Only compatible with OPF-equipped vehicles.


  • MSBM402 - LH OPF/GPF Bypass
  • MSBM403 - RH OPF/GPF Bypass
  • MSBM371 - Active Centre Section
  • F5158 x2 - Adaptor to OE system


  • High-quality type-304 aircraft-grade stainless steel
  • Precision, quality-controlled manufacturing to ISO 9001 standards
  • Deletes factory OPF/GPF
  • Substantial weight savings over original equipment exhaust systems
  • Reduced back pressure
  • Sharper throttle response
  • Designed & manufactured in the UK

Compatible Models

  • BMW F90 M5 (2021+)
  • BMW F90 M5 Competition LCI (2021+)

NOT compatible with pre-facelift F90 M5. For this version, click [here](link to the pre-facelift version).

At Racehaus, we value customer satisfaction above all else. We strive to ensure that all products are in stock and ready to ship. However, in the instance that a product is not immediately available, we will promptly notify you before you place your order, so you can avoid any disappointment. 

Our typical turnaround time for dispatch is between 2 to 5 days. Shipping starts from as little as £5.99

Please note that this timeframe may be subject to supplier availability. We take pride in being transparent about lead times, and if a product has a longer lead time, we will personally contact you to provide updates on the shipping process. 

Let us take care of all your product needs with excellent customer service.
We are happy to inform you that we offer worldwide shipping on all our products. You can place your order with confidence knowing that we are committed to maintaining a high level of service quality. 

In case you need to return your product, we offer a 14-day return policy. Please refer to our returns policy for more details. 

Additionally, to give you extra peace of mind, This product comes with a manufacturer's warranty. You can check our warranty policy for more information.

We're committed to providing you with personalised support and assurance with all your order decisions. Our team is constantly striving to improve your experience with us, and we stand behind every product we sell. We're here to help answer any questions you may have. 

Don't hesitate to contact us for more information or assistance.

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