Milltek Sport BMW G20/G21 M340i & G22 M440i OPF-Back Exhaust System (Requires Cutting)

Upgrade the sound and appearance of your BMW G20/G21 M340i or G22 M440i with the Milltek Sport OPF-Back Exhaust System.

Designed as a direct replacement for the original rear exhaust system, this Milltek Sport system is engineered to enhance the vehicle's exhaust sound and aesthetics while retaining the factory OPF/GPF-equipped configuration.

The system is manufactured from 304L Aircraft Grade stainless steel, providing excellent durability and corrosion resistance for demanding driving conditions.

This version is designed to use the original BMW exhaust tips/trims, allowing you to maintain the factory exterior appearance while upgrading the exhaust system.

Important: This system requires cutting of the OE exhaust during installation.

Key Features

• Genuine Milltek Sport performance exhaust
• OPF-back exhaust system
• Designed for BMW G20/G21 M340i
• Designed for BMW G22 M440i
• Designed for B58-powered models
• 76.2 mm pipe diameter
• Valved exhaust system
• Uses original BMW exhaust tips/trims
• 304L Aircraft Grade stainless steel construction
• Designed as a replacement for the OE rear exhaust system
• Designed to improve exhaust sound and aesthetics
• E-marked
• Not a race product
• Manufactured in the UK by Milltek Sport
• Requires cutting of the OE exhaust

Vehicle Fitment

BMW G20/G21 M340i xDrive

OPF/GPF-equipped models

• 2019–2025
• Pre-LCI
• G20 M340i xDrive Saloon
• G21 M340i xDrive Touring

BMW G20 M340i Sedan

• 2021–2025
• Pre-LCI
• North American / ROW models

BMW G22 M440i Coupe

• 2021–2025
• Pre-LCI
• North American / ROW models
• 2020–2025 OPF/GPF-equipped models

Included Components

The Milltek Sport system includes:

• LH Adaptor — MSBM334
• RH Adaptor — MSBM335
• LH Axle Pipe — MSBM336
• RH Axle Pipe — MSBM337
• Rear Silencer Assembly — MSBM338
• LH Outlet Pipe to OE Trims — MSBM339
• RH Valved Outlet Pipe to OE Trims — MSBM340
• Milltek Fitting Kit — SSXBM1157

Exhaust Sound

The Milltek Sport OPF-back system is designed to provide a more pronounced and sporty exhaust character than the factory system.

E-Mark Certification

This system is listed by Milltek Sport as E-marked.

E-Mark Number: BMWM340

This makes this version different from Milltek's non-E-marked race/OPF-bypass configurations.

Customers should still verify local requirements before installation.

The system's valved configuration allows the exhaust sound to remain more controlled during normal driving while providing a more aggressive and engaging sound when the valves open.

Actual exhaust sound will vary depending on the vehicle, driving mode, software, downpipe, OPF/GPF configuration and other modifications.

Important Fitment Information

Before ordering, customers should verify:

• BMW model
• Model year
• G20/G21/G22 chassis
• OPF/GPF configuration
• Pre-LCI status
• North American / ROW specification
• xDrive configuration where applicable