BMW G80/G82, M3/M4 Stainless Steel Axle Back Exhaust

BMW G80/G82 M3/M4 Stainless Steel Axle Back Exhaust

Transform the sound of your BMW G80 M3 or G82 M4 with this Stainless Steel Valved Axle Back Exhaust — the rear section only, engineered to deliver an aggressive exhaust note and switchable valve control without touching the rest of the factory system.

An axle back replaces the rear muffler section behind the rear axle and bolts straight to your existing mid pipe. It is the most direct way to change how the S58 sounds: all of the tone, none of the mid-pipe work, and a genuinely straightforward installation.

Manufactured from premium T304 stainless steel with mandrel bends and precision TIG welding throughout, the system carries its own valve assembly and is supplied complete with the wireless remote kit and quad carbon fibre tips.

Ideal for owners who want the sound and presence of a full system while keeping the factory mid section — and the simplest valved upgrade available for the G8X platform.

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 a quieter OEM+ driving experience, and fully unobstructed when open for a fully aggressive exhaust tone.

Rear Section Only

Replaces the factory rear muffler section and bolts to your existing mid pipe — a far simpler installation than a full system, with no cutting or fabrication.

Premium T304 Stainless Steel Construction

Manufactured from high-quality T304 stainless steel for exceptional durability, corrosion resistance and heat tolerance.

Precision TIG Welded

Engineered for maximum strength and long-term reliability under demanding driving conditions.

Remote Controlled Operation

Valve operation is handled entirely by the supplied remote. The system does not connect to the factory valve motors.

Direct Bolt-On Fitment

Designed specifically for the G80 and G82 chassis using factory mounting locations and hanger positions.

Fits Both OPF and Non-OPF Cars

On the G8X the particulate filter sits in the centre section, ahead of the rear muffler. An axle back replaces only the rear section, so it does not interact with the filter at all — the same system fits European filter-equipped cars and Australian, New Zealand and North American cars alike.

That is one of the real advantages of an axle back over a full system: no specification to get wrong.

Performance Benefits

• Aggressive performance exhaust note
• Switchable quiet and loud driving modes
• Enhanced turbo spool and overrun acoustics
• Reduced weight over the factory rear section
• Simplest valved exhaust installation for the platform
• Retains the factory mid section and filter

An axle back is a sound and presence upgrade. Meaningful power gains require a full system, downpipes and supporting modifications.

Sound Characteristics

Valves Closed

• Refined and comfortable cruising sound
• Minimal cabin drone
• Ideal for everyday driving and long-distance trips

Valves Open

• Deep and aggressive S58 tone
• Increased exhaust volume
• Enhanced turbo spool and overrun acoustics
• Sportier cold starts
• More engaging driving experience throughout the rev range

Vehicle Fitment

BMW G80 M3 / M3 Competition (2021+)
BMW G82 M4 / M4 Competition (2021+)

3.0L Twin-Turbocharged S58 Engine

Please Note

Professional installation is strongly recommended.

Exhaust sound may vary depending on whether the factory downpipes or aftermarket catted or catless downpipes are installed.

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.