KYOSTAR Axle-Back Exhaust System for 2021+ BMW G80 G81 M3 G82 G83 M4 Competition S58 3.0TT Performance Exhaust Kit

KYOSTAR Axle-Back Exhaust System for 2021+ BMW G80 G81 M3 G82 G83 M4 Competition S58 3.0TT Performance Exhaust Kit

Upgrade the rear exhaust setup of your BMW M3 or M4 with the KYOSTAR Axle-Back Exhaust System. Listed for selected BMW G80/G81 M3 and G82/G83 M4 applications equipped with the S58 3.0L twin-turbocharged inline-six engine, this aftermarket rear exhaust assembly features formed metal tubing, muffler components, and black exhaust tips.

Designed for BMW performance enthusiasts, the KYOSTAR axle-back system offers an aftermarket rear exhaust configuration for compatible M3 and M4 models. Its visible metal pipework and black exhaust outlets create a distinctive performance-inspired appearance.

The supplied product image shows a rear exhaust assembly with curved metal piping, muffler-style components, and black exhaust tips. Exact exhaust-tip dimensions, muffler internals, material grade, and valve configuration are not specified in the supplied product information.

Whether you're customizing a daily-driven BMW M3 or building a performance-focused M4, this axle-back exhaust is intended for the source-listed S58 applications, subject to vehicle-specific fitment verification.

Actual exhaust sound, tone, and driving characteristics depend on the complete vehicle exhaust configuration, factory components, and installation.

Features

• Axle-back exhaust system for selected BMW M3 and M4 applications.
• Listed for BMW G80/G81 M3 and G82/G83 M4 chassis.
• Designed for compatible BMW S58 3.0L twin-turbocharged engine applications.
• Performance-inspired aftermarket rear exhaust configuration.
• Formed metal exhaust tubing visible in the supplied product image.
• Muffler-style components integrated into the rear exhaust assembly.
• Black exhaust tips for a distinctive rear-end appearance.
• Dual-sided exhaust outlet layout as shown.
• Aftermarket alternative to compatible factory rear exhaust components.
• Suitable for selected BMW M3 and M4 Competition configurations, subject to verification.
• Designed for compatible performance exhaust customization projects.
• Visible pipe bends and joining sections for the rear exhaust layout.
• Vehicle-specific mounting and connection verification recommended.
• Exhaust sound characteristics depend on the complete vehicle setup.
• Professional installation recommended.

Fitment

BMW M3:

• 2021+ BMW M3 Sedan (G80) — S58 3.0TT, source-listed range.
• BMW M3 Touring (G81) — S58 3.0TT; exact applicable model years require confirmation.
• BMW M3 Competition (G80/G81) — S58 3.0TT, where applicable and subject to fitment verification.

BMW M4:

• 2021+ BMW M4 Coupe (G82) — S58 3.0TT, source-listed range.
• 2021+ BMW M4 Convertible (G83) — S58 3.0TT, where applicable.
• BMW M4 Competition (G82/G83) — S58 3.0TT, subject to fitment verification.

Vehicle Make: BMW

Vehicle Models: M3 / M4 / Competition Variants

Chassis Codes: G80 / G81 / G82 / G83

Engine Platform: S58

Engine Displacement: 3.0L Twin-Turbocharged

Engine Configuration: Inline 6-Cylinder

Product Type: Axle-Back Exhaust System

Important Fitment Note

Please verify your BMW model, chassis code, production year, S58 engine configuration, factory rear exhaust connections, mounting points, and exhaust-tip clearance before ordering.

The 2021+ model-year designation is taken from the supplied product source and should not be interpreted as the exact production-year range for every listed chassis.

BMW G80, G81, G82, and G83 models may have differences in rear bumper design, exhaust mounting, underbody layout, and factory exhaust components.

Compatibility with all M3 and M4 Competition variants has not been independently verified.

The supplied product information does not confirm whether the exhaust incorporates active valves, factory valve-actuator compatibility, or any electronic valve-control system.

The supplied product information also does not specify the exact pipe diameter, exhaust-tip diameter, muffler construction, or metal grade.

Before purchasing, compare the product image with your factory exhaust assembly and verify the required connection points, mounting brackets, hangers, and rear bumper clearance.

Vehicles equipped with aftermarket midpipes, modified rear bumpers, non-factory exhaust systems, or additional underbody modifications may require further fitment verification.

The complete package contents and installation hardware should be confirmed before purchase.

Fitment Note

The KYOSTAR Axle-Back Exhaust System is listed for selected BMW G80/G81 M3 and G82/G83 M4 vehicles equipped with the S58 3.0L twin-turbocharged inline-six engine.

The supplied product image shows formed metal exhaust piping, muffler-style components, and black exhaust outlets.

The original source identifies the product as an axle-back exhaust system, indicating a rear exhaust section rather than a complete turbo-back exhaust assembly.

The exact factory exhaust components removed or retained during installation depend on the vehicle's rear exhaust configuration and the complete kit design.

The source does not specify the exact exhaust material grade, pipe diameter, muffler internals, tip dimensions, or valve-control configuration.

Actual exhaust sound and tone depend on the vehicle's engine, factory or aftermarket midpipe, catalytic converters, and other exhaust components.

No verified sound measurements, horsepower gains, torque gains, or exhaust-flow improvements are provided.

Professional installation and vehicle-specific fitment verification are recommended.

Product Details & Technical Specifications

Why Upgrade Your Factory Axle-Back Exhaust?

The factory exhaust system on a BMW M3 or M4 is designed to balance sound, emissions requirements, packaging, and everyday driving characteristics.

An aftermarket axle-back exhaust provides an alternative rear exhaust configuration for enthusiasts who want to customize their vehicle's exhaust appearance and potentially change its sound characteristics.

The KYOSTAR Axle-Back Exhaust System features formed metal tubing, muffler-style components, and black exhaust outlets for a distinctive performance-inspired rear-end appearance.

Actual exhaust sound, volume, and tone depend on the complete exhaust system and vehicle configuration.

No specific horsepower increase, torque gain, or measured sound improvement is claimed without supporting test data.

FAQ

Q: What BMW models does this axle-back exhaust fit?
A: The source lists selected BMW G80/G81 M3 and G82/G83 M4 applications equipped with the S58 engine. Exact fitment requires verification.

Q: Will this fit a BMW G80 M3?
A: The source lists 2021+ BMW G80 M3 applications. Verify the production year and factory rear exhaust configuration.

Q: Will this fit a BMW G81 M3 Touring?
A: The source includes G81 M3 applications. Exact applicable years and rear exhaust mounting require confirmation.

Q: Will this fit a BMW G82 M4?
A: The source lists G82 M4 applications. Confirm your exhaust connections and mounting configuration.

Q: Will this fit a BMW G83 M4 Convertible?
A: The source includes G83 M4 applications. Vehicle-specific fitment verification is recommended.

Q: Will this fit an M3 or M4 Competition?
A: Competition variants appear in the supplied fitment information. Exact compatibility should be confirmed before ordering.

Q: Is this an axle-back exhaust system?
A: Yes. The source product name identifies it as an axle-back exhaust.

Q: Does this include a muffler?
A: Muffler-style components are visible in the supplied product image. Confirm the complete package contents before purchase.

Q: Are the exhaust tips black?
A: Black exhaust tips are visible in the supplied product image.

Q: Is this a valved exhaust system?
A: The supplied information does not confirm an active valve configuration or valve-control method.

Q: What material is the exhaust made from?
A: The exact metal material and grade are not specified in the supplied product information.

Q: What is the exhaust pipe diameter?
A: The exact pipe diameter is not provided.

Q: Will this change the exhaust sound?
A: An aftermarket axle-back exhaust may change sound characteristics. Actual results depend on the complete vehicle setup.

Q: Does this increase horsepower?
A: No verified dyno data is provided, so no specific horsepower or torque gain is claimed.

Q: Does the kit include installation hardware?
A: The complete hardware list is not confirmed. Verify the required clamps, brackets, hangers, and other accessories before purchase.

Q: Is professional installation recommended?
A: Yes. Professional installation is recommended to verify secure mounting, proper exhaust connections, and rear bumper clearance.

Installation Note

Allow the engine and exhaust components to cool completely before beginning installation.

Inspect the factory rear exhaust assembly and confirm that the KYOSTAR axle-back system matches the intended vehicle application.

Verify the required mounting points, connection dimensions, exhaust hangers, and rear bumper clearance.

Remove the appropriate factory rear exhaust components according to the applicable BMW service procedures.

Install the KYOSTAR axle-back exhaust using the correct mounting hardware and exhaust connections for the specific vehicle.

Check that all exhaust pipes, muffler components, and exhaust tips are securely mounted and maintain adequate clearance from surrounding underbody and bumper components.

After installation, inspect the system for exhaust leaks, vibration, rattling, and interference.

Professional installation is recommended.

Warranty & Shipping

Please review the applicable KYOSTAR warranty terms before purchasing. Warranty coverage, duration, and exclusions are subject to the policy in effect at the time of purchase.

Inspect the product upon delivery for visible shipping damage, missing components, or other concerns. Retain the original packaging and contact KYOSTAR customer support if an issue is identified.

Before installation, verify that the received product matches SKU NA-AB-5106-SS-MB and the intended BMW M3/M4 S58 application.

Shipping availability, dispatch location, and delivery time depend on inventory status and destination. Please review the shipping information provided at checkout or contact KYOSTAR customer service.

For fitment assistance, installation questions, shipping information, or after-sales support, please contact KYOSTAR customer service.