Milltek Sport BMW G20/G21 M340i & G22 M440i Cat-Back Exhaust with OPF Bypass

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

Designed as a direct replacement for the original exhaust system, this Milltek Sport cat-back system is engineered to provide a more aggressive and sporty exhaust character while offering increased exhaust flow.

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

This configuration uses the vehicle's OEM exhaust tips/trims, allowing you to retain the factory appearance while upgrading the exhaust system underneath.

Key Features

• Genuine Milltek Sport performance exhaust
• Cat-back exhaust system
• OPF/GPF bypass configuration
• Designed for BMW G20/G21 M340i xDrive
• 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
• Direct replacement for the OE exhaust system
• Designed to improve exhaust sound and aesthetics
• Race product
• Not E-marked
• Manufactured in the UK by Milltek Sport

Vehicle Fitment

BMW G20/G21 M340i xDrive

OPF/GPF-equipped models only

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

BMW G22 M440i

OPF/GPF-equipped models only

• 2020–2025
• Pre-LCI
• G22 M440i Coupe

Included Components

The Milltek Sport system includes:

• 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
• Front Connecting Pipe — MSBM343
• GPF/OPF Bypass Section — MSBM344
• GPF/OPF Bypass LH Section — MSBM345
• GPF/OPF Bypass RH Section — MSBM346
• Milltek fitting kit — SSXBM1160

Exhaust Sound

The Milltek Sport cat-back system is designed to give the B58 engine a more aggressive and sporty exhaust note compared with the factory system.

The valved design allows the exhaust character to vary depending on the vehicle's operating mode and valve position, providing a more controlled sound during normal driving and a more pronounced sound when driving enthusiastically.

The OPF/GPF bypass configuration further changes the exhaust character and allows for increased exhaust flow.

Note: Exhaust sound can vary depending on vehicle configuration, software, downpipe, OPF/GPF setup and other modifications.

Race Product

Milltek lists this system as a Race Product.

It is also listed as not E-marked.

Customers should check local regulations regarding exhaust modifications and emissions equipment before purchasing or installing this system.

Important Fitment Information

This system is specifically listed for OPF/GPF-equipped BMW models.

Before ordering, customers should confirm:

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