BMW M340i xDrive Saloon G20 & Touring G21 (OPF/GPF Models) Exhaust System by Milltek (2019+)
Description
The Milltek Sport exhaust system for the BMW M340i xDrive (G20 saloon and G21 Touring) is the definitive aftermarket exhaust upgrade for owners of the OPF/GPF-equipped B58 engine. Designed and manufactured in the UK by Milltek Sport – the brand that has set the benchmark for performance exhaust engineering since 1983 – this system is engineered to work specifically with the OPF/GPF filter present on post-2019 M340i models, producing a more characterful exhaust note and improved exhaust flow without compromising driveability or emissions compliance.
The system is ECE approved, carrying the relevant European type-approval certification for road use. Installation requires the original exhaust system to be cut at a specific point to accept the Milltek connection – a process performed during fitment to ensure a precision join. For owners seeking maximum performance gains, an OPF delete variant is also available: this removes the particulate filter entirely and is intended for off-road or track use only. The OPF delete variant requires a module cable or vehicle coding to prevent fault codes.
Key Features
- Milltek Sport UK-designed and manufactured performance exhaust system
- Engineered specifically for OPF/GPF-equipped BMW M340i xDrive (B58 engine)
- ECE approved – road legal across ECE signatory countries
- Enhanced exhaust note and improved exhaust flow over the factory system
- Installation requires cutting of the original exhaust – professional fitting recommended
- OPF delete variant available for additional performance gains (off-road use only)
- OPF delete requires module cable or vehicle coding to suppress fault codes
Fitment / Compatibility
| Model |
Years |
Chassis |
Body Style |
Notes |
| BMW M340i xDrive |
2019+ |
G20 |
Saloon |
OPF/GPF models only |
| BMW M340i xDrive |
2019+ |
G21 |
Touring/Estate |
OPF/GPF models only |
FAQs
Q: Is this exhaust road legal?
A: The standard OPF/GPF-compatible Milltek system is ECE approved for road use. The optional OPF delete variant is designed primarily for off-road and track use – check regional emissions regulations before purchasing.
Q: Why does installation require cutting the original exhaust?
A: The Milltek system joins onto the factory exhaust at a specific point requiring the original pipe to be cut to the correct length. This is standard procedure and ensures a precise, leak-free join. Professional fitting is strongly recommended.
Q: What is the OPF delete variant?
A: The OPF delete removes the particulate filter, reducing backpressure for increased performance and a louder sound. It is designed for off-road/track use only and requires a module cable or ECU coding to suppress fault codes.
Q: Does this fit both the G20 saloon and G21 Touring?
A: Yes. This system is compatible with both the G20 saloon and G21 Touring body styles of the M340i xDrive.
Q: Can AUTOID fit this exhaust?
A: Yes. Fitting is available at our Chelmsford, Essex facility and via our global network of partnered dealers. Contact [email protected] to arrange.
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