BMW M340i xDrive Saloon G20 & Touring G21 (OPF/GPF Models) Exhaust System by Milltek (2019+)

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 Brentwood, Essex facility and via our global network of partnered dealers. Contact [email protected] to arrange.