IRL G8X 3.5” MaxFlow Race Downpipes

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

Looking to maximize everything your S58 is capable of?

The factory catalytic converters create unnecessary restriction, limiting exhaust flow, turbo efficiency, and overall performance. If you’re building for maximum power, a true race downpipe is one of the most effective upgrades you can make.

The IRL 3.5” MaxFlow Race Downpipes replace the restrictive factory catalytic converters with a true 3.5-inch mandrel-bent design, delivering exceptional exhaust flow, faster turbo spool, and significant performance gains while unleashing the full sound of the S58.

Louder.
Faster.
Maximum Flow.

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Why these Downpipes

Built for enthusiasts chasing every bit of performance, the IRL MaxFlow Race Downpipes feature a true 3.5-inch design that minimizes backpressure and allows the turbochargers to breathe more efficiently.

The improved exhaust flow helps the turbos spool faster, improves throttle response, and increases horsepower and torque—especially when paired with ECU tuning.

Constructed from premium T304 stainless steel with precision TIG welds, these downpipes are built to withstand extreme temperatures while providing an OEM-style bolt-on fit.

True 3.5” MaxFlow design.
Faster turbo spool.
Built for maximum performance.

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Installation Overview

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

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Fitment

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

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Construction

• True 3.5” MaxFlow Mandrel-Bent Design
• Premium T304 Stainless Steel Construction
• Precision TIG Welded
• Race Design for Maximum Exhaust Flow
• OEM-Style Bolt-On Fitment

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What’s Included

• IRL 3.5” MaxFlow Race Downpipes
• Required Installation Hardware

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Important Notes

• Intended for off-road / motorsport use only
• Removes the factory catalytic converters
• A check engine light (CEL) is expected on factory engine calibrations
• ECU tuning is strongly recommended to maximize performance and optimize operation
• Not legal for use on public roads, highways, or emissions-controlled vehicles

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Automaz Approved

If you’re chasing maximum power from your S58, race downpipes are one of the biggest performance upgrades you can make.

The IRL 3.5” MaxFlow Race Downpipes deliver the unrestricted airflow, aggressive exhaust note, and improved turbo response that serious enthusiasts demand.

Built for those who want the most performance possible from their S58.

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.

• IRL, Automaz Collective, and its 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.

For Off-Road/Racing Use Only: These race downpipes remove the factory catalytic converters and are intended for closed-course competition vehicles only. A check engine light (CEL) is expected on factory engine calibrations. ECU tuning is recommended to maximize performance and optimize operation.