BMW G90/G99 M5 Stainless Steel Valved Catback Exhaust

BMW G90/G99 M5 Stainless Steel Valved Catback Exhaust

Restore the voice of your BMW G90 M5 or G99 M5 Touring with this Stainless Steel Valved Catback Exhaust System, engineered specifically for the S68 twin turbo V8 hybrid powertrain.

The G90 generation is the quietest M5 BMW has ever built. Tightened noise regulations and the hybrid drivetrain leave an enormously capable V8 sounding muted from the driver's seat. This system replaces the restrictive factory rear section and gives the car the presence its performance deserves.

An independent Varex valve system, controlled by remote, means the choice is always yours. Closed, the car remains as discreet as standard. Open, the S68 finally sounds like a V8 M car.

Manufactured from premium SS304 stainless steel with a heavier wall thickness than most systems in this class, and precision TIG welded throughout, it retains every factory mounting point for a straightforward bolt on installation.

For the current M5, this is the single most transformative modification available, and it changes nothing about how the car drives.

Key Features

Independent Varex Valve System

Rather than reusing the restricted factory valves, this system operates its own dedicated valve assembly with complete travel in both directions. Sealed when closed for quiet running, and fully unobstructed when open for maximum flow and volume. Switch between a refined daily-driving experience and an aggressive performance exhaust note at the touch of a button.

Premium SS304 Stainless Steel Construction

Corrosion resistant stainless steel with a substantial wall thickness, built for durability under sustained high exhaust gas temperatures.

Engineered for the S68 Hybrid V8

Designed around the current generation M5 powertrain and its exhaust routing rather than adapted from an earlier platform.

Transforms an Exceptionally Quiet Car

Addresses the single most common criticism of the G90 M5 by unlocking the V8 tone the factory system suppresses.

Precision TIG Welded

Fish scale TIG welding throughout, pressure tested for integrity before dispatch.

Mandrel Bent Tubing

Maintains a consistent internal diameter through every bend so flow is never choked.

Direct Bolt On Fitment

Uses the factory mounting locations and hanger positions, with no cutting or welding required.

Performance Benefits

• Increased exhaust flow efficiency
• Sharper throttle response
• Deep, authoritative V8 exhaust tone
• Reduced exhaust restriction
• Ideal supporting modification for downpipes and ECU tuning
• Full daily drivability retained through valve control

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

Sound Characteristics

Valves Closed

• Close to factory refinement
• Minimal drone for comfortable daily driving
• Discreet during electric and low load running

Valves Open

• Deep and commanding twin turbo V8 tone
• Large increase in volume under acceleration
• Enhanced crackles and pops when tuned
• More pronounced cold starts
• Strong V8 character across the rev range

Vehicle Fitment

BMW G90 M5 Sedan (2024+)
BMW G99 M5 Touring (2024+)

4.4L S68 Twin Turbocharged V8 Hybrid Engine

Please Note

Professional installation is strongly recommended.

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

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.