IRL G8X MaxFlow Race 400 - CEL Downpipes

Available to Order: Ships August 10

Looking for the perfect balance between performance and refinement?

The factory downpipes on the S58 restrict exhaust flow, limiting turbo efficiency and muffling the true character of the engine. While catless downpipes deliver maximum performance, they aren't the right fit for every owner.

The IRL MaxFlow 400 Cell High-Flow Downpipes are engineered for enthusiasts who want substantial performance gains while maintaining a smoother, more refined exhaust tone. Featuring premium 400-cell metallic catalytic converters, they improve exhaust flow, reduce back pressure, and help your turbos breathe more efficiently without introducing excessive volume or rasp.

Refined.
Responsive.
Built to Perform.

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Why these Downpipes

The IRL MaxFlow design promotes smoother exhaust flow throughout the entire system, allowing the turbochargers to spool faster while improving horsepower, torque, and throttle response.

Unlike lower cell-count catalytic converters, the premium 400-cell metallic catalysts help preserve a more refined exhaust note, making these an excellent option for enthusiasts who want improved performance without sacrificing daily drivability.

Designed around OEM mounting locations, these downpipes install like factory components while offering the durability and performance expected from a premium aftermarket upgrade.

Improved airflow.
Faster spool.
Refined performance.

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Installation Overview

• Direct bolt-on replacement for factory downpipes
• Utilizes OEM mounting locations for factory-style fitment
• Compatible with OEM and most aftermarket cat-back exhaust systems
• Professional installation recommended

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Fitment

• G80 M3
• G81 M3 Touring
• G82 M4 Coupe
• G83 M4 Convertible
• G87 M2

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Construction

• Premium 400-Cell High-Flow Metallic Catalytic Converters
• IRL MaxFlow Exhaust Design
• T304 Stainless Steel Construction
• Precision TIG Welded
• Optimized Flow Path for Reduced Backpressure
• OEM-Style Mounting Locations

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What's Included

• IRL MaxFlow 400 Cell High-Flow Downpipes
• Required Installation Hardware

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Important Notes

• Intended for off-road / motorsport use only where permitted by law
• These downpipes are not EPA certified
• While the 400-cell c atalyst design significantly reduces the likelihood of a CheckEngine Light (CEL) compared to lower-cell-count downpipes, IRL does not guarantee a CEL-free experience
• A Check Engine Light may still occur depending on ECU software, fuel quality, driving conditions, environmental conditions, and manufacturing tolerances
• ECU tuning may be recommended to optimize performance and catalyst efficiency

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Automaz Approved

The IRL MaxFlow 400 Cell Downpipes are the ideal choice for enthusiasts who want a meaningful performance upgrade without stepping into the full aggression of a catless setup.

You get improved turbo response, increased power, and a deeper, more refined exhaust note while retaining high-flow metallic catalytic converters.

If you're looking for the sweet spot between daily drivability and S58 performance, these are hard to beat.

Emissions Disclaimer

This product is not EPA certified and 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 federal, state, and local emissions laws and regulations.

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

• Use of this product on public roads may violate the Federal Clean Air Act (42 U.S.C. § 7522), Illinois state law, and similar emissions regulations in other jurisdictions.

Please check your local laws before purchasing and installing this product.

Important Information: These 400-cell downpipes are not EPA certified and are intended for off-road and motorsport use only where permitted by law. While the 400-cell catalyst design significantly reduces the likelihood of a check engine light compared to lower-cell-count options, IRL does not offer a no check engine light (CEL) guarantee with these units. A CEL may still occur depending on vehicle software, fuel quality, driving conditions, and manufacturing tolerances. ECU tuning may be recommended to optimize performance and catalyst efficiency.