OAO Valvetronic Axle-Back Exhaust System for BMW G8X M2 / M3 / M4 S58 3.0T

Elevate the Sound of the BMW S58

Designed for the BMW G87 M2, G80 M3, and G82/G83 M4 equipped with the legendary S58 3.0L twin-turbocharged inline-six engine, the OAO Valvetronic Axle-Back Exhaust System is engineered to deliver a more aggressive, refined, and customizable exhaust experience.

Replacing the factory rear exhaust section, the OAO Axle-Back system enhances exhaust acoustics while retaining the existing midpipe and downpipe configuration. The electronically controlled valves allow drivers to switch between a refined street-driving tone and an aggressive performance soundtrack whenever desired.

Built from premium T304 stainless steel with precision TIG welding, high-flow muffler technology, and carefully engineered exhaust routing, the OAO Axle-Back system combines performance, durability, and premium craftsmanship with a direct-fit installation.

Key Features

✓ Designed for BMW G87 M2 / G80 M3 / G82 G83 M4

✓ S58 3.0L Twin-Turbocharged Inline-6 Engine

✓ Valvetronic Axle-Back Exhaust System

✓ Electronic Exhaust Valve Control

✓ High-Flow Performance Muffler Design

✓ Premium T304 Stainless Steel Construction

✓ Precision TIG Welded

✓ Optimized Exhaust Flow

✓ Aggressive S58 Exhaust Sound

✓ Lightweight Performance Construction

✓ Factory-Style Mounting Locations

✓ Direct Bolt-On Installation

Intelligent Valvetronic Exhaust Control

Comfort / Street Mode

With the valves closed, the OAO Axle-Back system maintains a more controlled exhaust tone for comfortable everyday driving.

Ideal for:

• Daily Commuting

• Highway Cruising

• Long-Distance Driving

• Residential Areas

• Reduced Exhaust Volume

• Comfortable Street Use

Enjoy the performance character of the S58 without an unnecessarily aggressive exhaust tone during normal driving.

Sport / Open Valve Mode

Open the valves and unleash the aggressive character of BMW's S58 twin-turbo engine.

Experience:

• Increased Exhaust Volume

• Deeper Exhaust Tone

• Stronger Turbocharger Acoustics

• Sharper Acceleration Sound

• More Pronounced Gear-Shift Acoustics

• Enhanced High-RPM Exhaust Character

• More Aggressive M Performance Sound

The result is a more emotional and engaging driving experience.

Axle-Back Performance Design

The OAO Axle-Back system replaces the rear portion of the factory exhaust while allowing the original front and midpipe sections to remain in place.

This makes it an ideal upgrade for enthusiasts looking for a significant improvement in sound without replacing the entire exhaust system.

Potential benefits may include:

• Improved Exhaust Flow

• Reduced Rear Exhaust Restriction

• Enhanced Throttle Acoustics

• Stronger Turbocharger Sound

• More Aggressive Exhaust Character

• Reduced Weight Compared with Factory Rear Components

• Excellent Compatibility with Factory or Aftermarket Midpipes

• Easy Upgrade Path for Future Exhaust Modifications

Actual performance improvements may vary depending on the complete exhaust configuration.

Enhanced BMW M Sound

The S58 3.0T twin-turbocharged inline-six delivers an aggressive and powerful performance character.

The OAO Valvetronic Axle-Back enhances that personality with a carefully tuned exhaust note:

• Deeper Cold Start

• Richer Low-RPM Tone

• Stronger Turbocharger Sound

• Sharper Throttle Blips

• Enhanced Acceleration Acoustics

• More Aggressive Downshift Sound

• Stronger High-RPM Character

The valve-controlled design allows you to choose how aggressive your M car sounds at any moment.

Premium T304 Stainless Steel Construction

Manufactured from high-quality T304 stainless steel to withstand the high temperatures and demanding conditions associated with high-performance turbocharged engines.

Advantages include:

• Excellent Corrosion Resistance

• Superior Heat Resistance

• High Structural Strength

• Lightweight Performance Construction

• Precision TIG Welding

• CNC-Machined Connections

• Long Service Life

• Premium Surface Finish

Each OAO exhaust system is inspected before shipment to ensure precise dimensions and consistent manufacturing quality.

Premium Exhaust Tip Options

Complete the aggressive G8X appearance with premium exhaust tip options.

Available configurations may include:

• Carbon Fiber Exhaust Tips

• Titanium Burnt Exhaust Tips

• Polished Stainless Steel Tips

• Matte / Dark Finish Performance Tips

Large-diameter tips are designed to complement the distinctive BMW M rear diffuser and quad-exhaust styling.

Vehicle Fitment

Compatible with:

BMW G87 M2

• M2

• S58 3.0L Twin-Turbo Inline-6

BMW G80 M3

• M3 Sedan

• M3 Competition

• S58 3.0L Twin-Turbo Inline-6

BMW G82 M4

• M4 Coupe

• M4 Competition

• S58 3.0L Twin-Turbo Inline-6

BMW G83 M4

• M4 Convertible

• M4 Competition

• S58 3.0L Twin-Turbo Inline-6

Model Years

• 2021

• 2022

• 2023

• 2024

• 2025

• 2026+

Please verify your exact chassis, production year, exhaust configuration, and factory mounting layout before ordering.

Package Includes

• OAO Valvetronic Axle-Back Exhaust System

• Electronic Valve Control Module

• Wireless Remote Controller

• Exhaust Installation Hardware

• Exhaust Clamps / Connection Components

• Protective Packaging

Installation

Designed as a direct bolt-on replacement for the factory rear exhaust section.

The system utilizes factory mounting locations and existing exhaust connection points.

No permanent cutting or welding is required for standard installation.

Professional installation is recommended to ensure correct alignment, sealing, and valve operation.

Compatible Performance Upgrades

The OAO G8X Axle-Back Exhaust System can be combined with:

• OAO S58 Performance Downpipes

• OAO S58 Midpipe

• OAO Single Midpipe

• OAO Equal Length Midpipe

• High-Flow Downpipes

• Performance ECU Calibration

• Upgraded Intake System

• Carbon Fiber Exhaust Tips

• Titanium Exhaust Tips

For enthusiasts seeking a complete performance exhaust setup, combining an upgraded midpipe and downpipes with the OAO Valvetronic Axle-Back can further increase exhaust flow and sound intensity.

Important Notes

This product is designed for performance, off-road, or motorsport applications where permitted by local regulations.

Please verify local emissions and noise regulations before purchasing or installing this product.

Sound characteristics and performance results may vary depending on downpipes, midpipe configuration, ECU tuning, valve settings, and other vehicle modifications.

Why Choose OAO Performance

OAO Performance specializes in premium exhaust systems and performance components for BMW M, Mercedes-AMG, Audi RS, Porsche, Ferrari, Lamborghini, Aston Martin, Nissan GT-R, Chevrolet Corvette, and other high-performance vehicles.

Every OAO exhaust component combines advanced engineering, premium materials, precision TIG welding, and rigorous quality control to deliver exceptional fitment, durability, and sound.

Upgrade your BMW G87 M2, G80 M3, G82 M4, or G83 M4 with the OAO Valvetronic Axle-Back Exhaust System and experience a deeper, louder, and more aggressive S58 soundtrack with complete valve-controlled sound management.