KYOSTAR 3.5" Catless Downpipe with Heat Shield for 2021+ BMW G80 G81 M3 G82 G83 M4 G87 M2 S58 3.0TT

KYOSTAR 3.5" Catless Downpipe with Heat Shield for BMW G80 G81 M3 G82 G83 M4 G87 M2 S58 3.0TT

The KYOSTAR 3.5-Inch Catless Downpipe with Heat Shield is an aftermarket exhaust component listed for select BMW M3, M4, and M2 models equipped with the S58 3.0L twin-turbocharged inline-six engine.

Designed for compatible performance exhaust projects, this catless downpipe configuration replaces the catalytic-converter section of the applicable factory exhaust arrangement. Because this product is described as catless, it does not provide the emissions-control function of a catalytic converter.

The supplied product image shows two formed metal downpipe sections with silver-gray heat-shielding material wrapped around portions of the pipes. Small installation-related components are also visible in the product image.

The original product name specifies a 3.5-inch downpipe design and heat shielding. The exact measurement location, base pipe material, wall thickness, and heat-shield construction are not provided in the source specifications.

This product is intended for suitable off-road, competition, or other legally permitted applications. Buyers must verify applicable emissions and exhaust regulations before purchasing or installing catless exhaust components.

Features

• Catless downpipe configuration for selected BMW S58 applications.
• 3.5-inch size referenced in the source product title.
• Listed for BMW G80/G81 M3 and G82/G83 M4 applications.
• BMW G87 M2 also appears in the source fitment list.
• Designed for the BMW S58 3.0L twin-turbocharged inline-six engine platform.
• Two formed downpipe sections visible in the supplied product image.
• Heat-shielded pipe sections as shown.
• Silver-gray exterior appearance.
• Curved exhaust pipe routing configuration.
• Aftermarket component for compatible performance exhaust projects.
• Catless construction without a catalytic converter.
• Connection and sensor compatibility require vehicle-specific verification.
• Additional small components visible in the supplied product image.
• Professional exhaust installation recommended.
• Intended only for applications where installation and use are legally permitted.

Fitment

BMW M3:

• 2021+ BMW M3 (G80) — S58 3.0TT, source-listed range.
• BMW M3 Touring (G81) — S58 3.0TT; exact applicable model years require confirmation.

BMW M4:

• 2021+ BMW M4 (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 exact fitment verification.

BMW M2:

• BMW M2 (G87) — S58 3.0TT; listed in the source fitment column without a separate model-year range.

Vehicle Make: BMW

Engine Platform: S58

Engine Displacement: 3.0L Twin-Turbocharged

Engine Configuration: Inline 6-Cylinder

Product Type: Catless Downpipe with Heat Shield

Important Fitment Note

Please verify your BMW model, chassis code, production year, S58 engine configuration, turbocharger outlet connections, exhaust mounting positions, and sensor locations before ordering.

The source product title identifies 2021+ BMW G80/G81 M3 and G82/G83 M4 applications, while the source fitment column also includes G87 M2.

The G87 M2 does not have a separate confirmed model-year range in the supplied source. Its exact compatibility must be verified before purchase.

The supplied product information does not confirm that all listed BMW M3, M4, and M2 configurations share identical downpipe connections, mounting hardware, or sensor arrangements.

The 3.5-inch specification is provided in the product title, but the exact measurement point is not identified. Do not assume every inlet, outlet, or pipe section measures 3.5 inches.

The complete installation hardware, sensor fittings, and required adapters are not specified.

This is a catless exhaust component. Removing or replacing emissions-control equipment may violate applicable laws and regulations, including restrictions on public-road use.

Installation may trigger emissions-related diagnostic trouble codes or warning lights. The supplied information does not establish vehicle-specific electronic compatibility.

Please confirm the legal requirements applicable to your location and intended use before purchase or installation.

Fitment Note

The KYOSTAR Catless Downpipe with Heat Shield is listed for selected BMW vehicles equipped with the S58 3.0L twin-turbocharged inline-six engine.

The source includes BMW G80/G81 M3, G82/G83 M4, and G87 M2 applications. Differences in production year, exhaust routing, factory sensors, and mounting configurations may affect compatibility.

The supplied image shows two metal downpipe sections with heat-shielding material around portions of the assembly.

The source does not specify the exact base metal grade, wall thickness, heat-shield material, pipe diameter measurement points, or sensor fitting dimensions.

The supplied information does not confirm whether additional gaskets, clamps, brackets, or replacement fasteners are included.

A catless downpipe changes the factory exhaust and emissions-control configuration. It should not be represented as emissions-compliant or street-legal without applicable certification.

Actual exhaust sound, exhaust flow, turbocharger response, and engine performance depend on the complete vehicle setup.

No verified horsepower, torque, or exhaust-flow improvement figures are supplied, so no specific performance gains are claimed.

Professional installation and vehicle-specific fitment verification are recommended.

Product Details & Technical Specifications

Why Choose a Heat-Shielded Downpipe?

Turbocharged engines operate with high exhaust temperatures, making exhaust component design and thermal management important considerations in performance exhaust projects.

The KYOSTAR 3.5-Inch Catless Downpipe features heat-shielded pipe sections as shown in the supplied product image.

Heat shielding is generally used to help manage radiant heat around exhaust components. The effectiveness of any specific shielding design depends on its materials, coverage, installation, and operating conditions.

The catless configuration eliminates the catalytic converter from the applicable exhaust section. This changes the factory emissions-control arrangement and may affect exhaust sound and flow behavior.

No product-specific thermal testing, sound measurements, or dyno results are supplied. Therefore, no quantified temperature reduction or performance increase is claimed.

FAQ

Q: What BMW models is this downpipe listed for?
A: The source lists selected BMW G80/G81 M3, G82/G83 M4, and G87 M2 applications equipped with the S58 engine.

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

Q: Will this fit a BMW G82 M4?
A: The source lists 2021+ G82 M4 applications. Confirm the exact vehicle and exhaust 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 a BMW G81 M3 Touring?
A: The source includes G81 M3, but its exact applicable model years require confirmation.

Q: Will this fit a BMW G87 M2?
A: G87 M2 appears in the source fitment list. Exact model-year and connection compatibility require verification.

Q: Is this designed for the BMW S58 engine?
A: Yes. The source product name identifies the S58 3.0T engine platform.

Q: What does catless mean?
A: Catless means the downpipe does not contain a catalytic converter.

Q: Does this product include heat shielding?
A: The source title specifies heat shielding, and wrapped pipe sections are visible in the supplied product image.

Q: Is the pipe exactly 3.5 inches throughout?
A: The source lists 3.5 inches, but the measurement location and dimensions of individual pipe sections are not specified.

Q: What material is the downpipe made from?
A: The exact base metal and material grade are not provided.

Q: Does the package include two downpipe sections?
A: Two downpipe sections are visible in the supplied image. Confirm the final package contents before purchase.

Q: Will this change the exhaust sound?
A: A catless exhaust configuration may change sound characteristics, but actual results depend on the complete exhaust system.

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

Q: Will this cause a check engine light?
A: Changing catalytic-converter equipment may trigger emissions-related diagnostic trouble codes or warning lights.

Q: Is this street legal?
A: Street legality is not established. Catless exhaust components may be prohibited for public-road use under applicable emissions regulations.

Q: Is professional installation recommended?
A: Yes. Professional installation is recommended to verify connections, mounting, heat clearance, and compliance with applicable requirements.

Installation Note

Allow the engine, turbochargers, and exhaust components to cool completely before beginning any work.

Verify the exact vehicle application, exhaust connection dimensions, sensor arrangement, and required installation components.

Inspect the received downpipe sections and heat shielding for visible damage before installation.

Any removal or replacement of factory emissions-control components must comply with applicable laws and regulations.

Use the appropriate vehicle service procedures and installation hardware for the specific application.

Ensure the installed exhaust components maintain adequate clearance from surrounding wiring, hoses, heat-sensitive components, and underbody structures.

After installation, inspect the exhaust assembly for 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 KD5S011IN and the intended BMW S58 application.

This product is a catless exhaust component. Buyers are responsible for confirming applicable emissions and vehicle-use restrictions before purchase and installation.

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.