BMW B58 Gen 2 G-Series M340i/M440i/M240i Stainless Steel Valved Exhaust

BMW B58 Gen 2 G-Series M340i/M440i/M240i Stainless Steel Valved Exhaust

Transform the sound and character of your BMW B58TU-powered G-Series platform with this Stainless Steel Valved Exhaust System — engineered to deliver improved exhaust flow, enhanced turbo acoustics, and the perfect balance between refined daily driving and aggressive performance.

Designed specifically for the 3.0L Turbocharged B58 Gen 2 (B58TU) engine, this valved exhaust system replaces the restrictive factory rear section with a free-flowing design that allows the engine to breathe more efficiently. The result is improved throttle response, increased exhaust character, and an unmistakable straight-six soundtrack.

Featuring integrated valve control, this system offers the best of both worlds. Keep the valves closed for a refined OEM-like driving experience, or open them to unleash a deeper, louder, and more aggressive exhaust note with enhanced turbo spool and crackles under acceleration.

Constructed from premium T304 stainless steel and precision TIG welded throughout, this exhaust system is built to withstand extreme temperatures and demanding driving conditions while maintaining OEM-style fitment and long-term reliability.

Whether you're running a stock vehicle or a fully tuned setup, this Stainless Steel Valved Exhaust System delivers the perfect combination of sound, performance, and everyday usability.

Key Features

Integrated Valved Exhaust Design

Switch between a refined daily-driving experience and an aggressive performance exhaust note at the touch of a button.

Premium T304 Stainless Steel Construction

Manufactured from corrosion-resistant stainless steel for exceptional durability and long-term reliability.

Improved Exhaust Flow

Reduces exhaust restrictions and allows the B58TU engine to breathe more efficiently.

Signature B58 Sound Enhancement

Produces a deeper, smoother, and more aggressive straight-six exhaust note.

Precision TIG Welded

High-quality welds engineered to withstand extreme temperatures and demanding performance applications.

Mandrel-Bent Tubing

Maintains unrestricted exhaust flow and consistent pipe diameter throughout the system.

Direct Bolt-On Fitment

Designed specifically for BMW B58 Gen 2 (B58TU) G-Series vehicles using factory mounting locations.

Performance Benefits

• Increased exhaust flow efficiency
• Sharper throttle response
• Enhanced turbo spool acoustics
• Deeper and more aggressive exhaust tone
• Reduced exhaust restriction
• Ideal supporting modification for tuned and high-performance builds
• Maintains excellent daily drivability through valve control

Performance gains may vary depending on ECU calibration and supporting modifications.

Sound Characteristics

Valves Closed

• Refined OEM+ exhaust note
• Minimal drone for comfortable daily driving
• Smooth and subtle sound characteristics

Valves Open

• Deeper and more aggressive exhaust tone
• Increased turbo spool and whistle acoustics
• Enhanced crackles and pops (when tuned)
• Greater overall exhaust volume
• More pronounced cold starts
• Signature B58 straight-six sound throughout the rev range

Vehicle Fitment

BMW G20/G21 M340i xDrive (2019+)
BMW G22/G23/G26 M440i xDrive (2021+)
BMW G42 M240i xDrive (2022+)

3.0L Turbocharged B58 Gen 2 (B58TU) Engine

Please Note

Professional installation is strongly recommended.

Exhaust sound characteristics may vary depending on supporting modifications such as downpipes and ECU tuning.

Vehicles equipped with OPF/GPF emissions systems may require alternative configurations.

Why Choose Proven Performance Parts

We specialise in high-performance parts for European vehicles — including Volkswagen GTI & R models, Audi S/RS platforms, and BMW M vehicles. Every product we offer is carefully selected for its quality, fitment, and real-world performance — tested by enthusiasts, for enthusiasts.