MAD F9X S63R Secondary Downpipes – BMW M5 / M8 (F90/F92)

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

Looking to unlock a more aggressive exhaust note from your S63R?

The factory secondary downpipes restrict exhaust flow and limit the sound of your twin-turbo V8.

The MAD Secondary Downpipes replace the factory secondary catalytic converter sections with free-flowing stainless steel piping, allowing your F90 M5 or F9X M8 to produce a deeper, more aggressive exhaust note while retaining the factory primary downpipes.

More sound. Better airflow. No check engine light.

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Why These Downpipes

MAD designed these secondary downpipes for enthusiasts who want increased exhaust volume and improved airflow without the added complexity of replacing their primary downpipes.

Featuring smooth mandrel-bent stainless steel piping, these downpipes reduce exhaust restrictions while delivering a more pronounced V8 exhaust note.

Because the factory primary catalytic converters remain in place, MAD advertises these secondary downpipes as a no-CEL upgrade. The integrated flex sections help reduce stress and unwanted vibration, while the optimized piping is designed to minimize unwanted drone.

MAD also advertises power gains of up to 30 HP on stock turbos, with additional potential on upgraded turbo setups. Actual gains depend on the vehicle's configuration and tuning.

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Installation Overview

• Direct bolt-on replacement for factory secondary downpipes

• Compatible with the factory exhaust system

• No cutting or welding required

• Compatible with left-hand drive and right-hand drive vehicles

• Professional installation recommended

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Fitment

BMW S63R Platform:

• 2018+ BMW F90 M5 / M5 Competition

• 2019+ BMW F91 M8 Convertible

• 2019+ BMW F92 M8 Coupe

• 2019+ BMW F93 M8 Gran Coupe

Compatible with both left-hand drive and right-hand drive vehicles.

Important Fitment Note for European 2021+ LCI Vehicles

MAD specifies compatibility with certain OPF-equipped vehicles. Before ordering, verify that your factory downpipes have a V-band slip-style connection rather than a flange/two-bolt design. 

Construction

• Premium Stainless Steel Construction

• Free-Flowing Secondary Cat-Delete Design

• Smooth Mandrel Bends for Improved Exhaust Flow

• Integrated Flex Sections for Reduced Stress and Vibration

• Optimized Piping Designed to Minimize Drone

• Precision-Engineered Direct Bolt-On Fitment

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What's Included

• MAD Secondary Downpipes

• Required Installation Hardware

• Gaskets

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Warranty & Returns

• Eligible for a 90-day return window if unused, uninstalled, and in original condition, subject to Automaz Collective's return policy

• Backed by MAD's lifetime warranty against manufacturing defects and fitment issues

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Important Notes

• Intended for off-road / motorsport use only

• Not legal for use on pollution-controlled vehicles operated on public roads

• MAD advertises no check engine light when replacing the secondary downpipes

• Factory primary catalytic converters remain in place

• Verify local emissions regulations before purchasing

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Automaz Approved

Looking to give your F90 M5 or F9X M8 a more aggressive exhaust note without replacing the factory primary downpipes?

The MAD Secondary Downpipes offer a straightforward way to increase exhaust volume and improve airflow while retaining the factory primary catalytic converters.

With stainless steel construction, integrated flex sections, and direct bolt-on fitment, these downpipes are an excellent option for enthusiasts looking to bring out more of the S63R's twin-turbo V8 sound.

More sound. Less restriction. No CEL.

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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 liability for improper or unlawful use of this product, to the extent permitted by law.

• 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.