MAD BMW S58 Catted 300 CEL Downpipes M2 M3 M4 G87 G80 G82 G83 W/ No CEL Guarantee & Flex Section

In Stock: Ships in 1-2 business days
Available to Order: Ships in 3-4 Weeks

Looking to wake up your S58 without sacrificing peace of mind?

The factory S58 downpipes limit exhaust flow, restricting turbo efficiency and muting both power and sound. While many aftermarket options increase performance, they often come with the risk of a persistent check engine light.

The MAD S58 300 Cell Race Catted Downpipes are designed to deliver substantial performance gains, faster turbo response, and a more aggressive exhaust note while utilizing premium 300-cell high-flow catalytic converters. Best of all, they're backed by MAD's 2-Year No Check Engine Light Guarantee, giving you confidence long after installation.

More Power.
No CEL.
Built to Last.

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Why these Downpipes

The 300-cell high-flow catalytic converters dramatically reduce exhaust restriction compared to the factory downpipes, allowing the S58's twin turbos to spool faster and operate more efficiently.

On tuned vehicles with stock turbos, gains of up to 30 horsepower are possible, with even greater performance potential on upgraded turbo setups.

Unlike many catted downpipes on the market, MAD stands behind these with a 2-Year No Check Engine Light Guarantee. If a catalyst-related check engine light occurs during the warranty period, MAD will replace the downpipes at no charge.

Combined with smooth mandrel bends, integrated flex sections, and OEM-style fitment, these downpipes are engineered for both performance and long-term reliability.

More airflow.
Faster spool.
Confidence included.

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Installation Overview

• Direct bolt-on replacement for factory downpipes
• Compatible with OEM and most aftermarket exhaust systems
• No cutting or welding required
• Professional installation recommended

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Fitment

• G80 M3 
• G81 M3 
• G82 M4 
• G83 M4 
• G87 M2 

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Construction

• Premium 300-Cell High-Flow Catalytic Converters
• T304 Stainless Steel Construction
• Precision Welded for Maximum Durability
• Smooth Mandrel Bends for Maximum Exhaust Flow
• Integrated Flex Sections for Reduced Stress and Increased Longevity
• OEM-Style Direct Bolt-On Fitment

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What's Included

• MAD S58 300 Cell Race Catted Downpipes

Required for Installation (Not Included):

• BMW Downpipe Gasket – Part Number 18308053348 (Quantity: 2)

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Warranty & Returns

• Eligible for a 90-day return window if unused, uninstalled, and in original condition
• 2-Year No Check Engine Light Guarantee for catalyst-related CELs
• Lifetime warranty against manufacturer defects and fitment issues

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Important Notes

• Intended for off-road / motorsport use only
• Race-use product

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Automaz Approved

If you're looking for the ideal middle ground between factory reliability and serious S58 performance, these are one of the easiest upgrades to recommend.

The combination of faster turbo response, increased horsepower, improved exhaust sound, and MAD's No CEL Guarantee makes these an outstanding option for enthusiasts who want to enjoy the benefits of upgraded downpipes without constantly worrying about warning lights.

Performance you can feel. Confidence you can trust.

Emissions Disclaimer

This product is not legal for sale or use on pollution-controlled vehicles operated on public roads, highways, or streets. It is intended for off-road, race, or closed-course competition use only, where such modifications are permitted.

By purchasing this product, you acknowledge and agree that:

• You are responsible for compliance with all applicable emissions laws and regulations.

• MAD, Automaz Collective, and their affiliates disclaim any liability for improper or unlawful use of this product.

• Use of this part on public roads may violate the Federal Clean Air Act (42 U.S.C. § 7522) and similar state laws.

Please check your local laws before purchase and installation.