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Shipping & Warranty

Milltek Sport BMW M3/M4 Resonated OPF/GPF Bypass Mid Section replaces the factory OPF filters to reduce back pressure and increase flow. In doing so, your G80 or G82 will see quicker throttle response and faster turbo spool. This results in improved low and mid range torque without sacrificing top end power. The OPF Bypass will also unlock greater tuning potential.

As this is a resonated Mid Section, the pipework features a single resonator that helps to make the exhaust noise slightly quieter for daily use. As a consequence of this, airflow is slightly more restricted than the non-resonated alternative.

Designed and manufactured in the UK!

*Please note: This OPF delete is only compatible with the factory BMW exhaust system. It DOES NOT FIT the Milltek Axle Back Exhaust System for the G80 3 and G82 M4.

In the box

F5161 x2 - Adaptors to OE Exhaust System
MSBM358 - Left-hand OPF/GPF Bypass Pipe
MSBM359 - Right-hand OPF/GPF Bypass Pipe
MSBM360 - Centre Silencer (Resonator)
F7096 - Chassis Brace Plate


- High quality type-304 aircraft grade stainless steel
- Precision, quality controlled manufacture to ISO 9001 standards
- Substantial weight saving over original equipment exhaust systems
- Reduces back pressure
- Sharper throttle response
- Designed & manufactured in the UK

Compatible models

- BMW G80 M3 Saloon (2021+)
- BMW G80 M3 Competition Saloon (2021+)
- BMW G81 M3 Touring (2023+)
- BMW G81 M3 Competition Touring (2023+)
- BMW G82 M4 Coupe (2021+)
- BMW G82 M4 Competition Coupe (2021+)
- BMW G83 M4 Convertible (2021+)
- BMW G83 M4 Competition Convertible (2021+)
GPF-equipped models ONLY

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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