MAD F9X S63R 300 CEL Catted Primary Downpipes (No CEL Guarantee) – BMW M5 / M8 (F90/F92)

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

Looking to unlock more power and sound from your S63R without worrying about a check engine light?

The factory primary downpipes restrict exhaust flow and limit the performance potential of your twin-turbo V8.

The MAD 300 CEL Catted Primary Downpipes replace the restrictive factory downpipes with high-flow catalytic converters, engineered to improve exhaust flow, increase power, and deliver a deeper, more aggressive exhaust note while maintaining everyday drivability.

Unlike traditional high-flow downpipes, these feature MAD's No CEL Guarantee. If a check engine light occurs due to the catalytic converters within two years of purchase, MAD will replace the affected downpipe at no charge.

More airflow. More sound. No CEL guarantee. 

⸻

Why These Downpipes

MAD designed these downpipes for enthusiasts who want improved performance and a more aggressive exhaust note without the check engine light commonly associated with aftermarket downpipes.

Featuring 300 CEL high-flow catalytic converters and smooth mandrel-bent piping, these downpipes reduce exhaust restrictions while retaining catalytic converters.

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

The integrated flex sections help reduce stress and unwanted vibration, while the optimized piping delivers a deeper exhaust note without introducing unwanted drone.

The biggest advantage? MAD backs these downpipes with a two-year No CEL Guarantee, providing additional peace of mind for enthusiasts who want improved performance without a catalyst-related check engine light.

Improved airflow. Faster turbo response. Performance without the CEL headache.

⸻

Installation Overview

• Direct bolt-on replacement for factory primary downpipes

• Compatible with OEM and aftermarket exhaust systems

• No cutting or welding required

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

• Professional installation recommended

⸻

Fitment

BMW S63R Platform:

• 2018+ BMW F90 M5 / M5 Competition

• 2018+ BMW F91 M8 Convertible

• 2018+ BMW F92 M8 Coupe

• 2018+ BMW F93 M8 Gran Coupe

⸻

Construction

• 300 CEL High-Flow Catalytic Converters

• Premium 304 Stainless Steel Construction

• Smooth Bends for Improved Exhaust Flow

• Optimized Piping Designed to Minimize Drone

• Integrated Flex Sections for Added Durability

• Precision-Engineered Direct Bolt-On Fitment

⸻

What's Included

- MAD 300 CEL Catted Primary Downpipes

⸻

Warranty & Returns

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

• Two-year No CEL Guarantee covering check engine lights caused by the catalytic converters

• Free replacement of the affected downpipe under MAD's No CEL Guarantee

• Lifetime warranty against manufacturing defects, including cracks in the piping or welds, and fitment issues

The No CEL Guarantee applies for two years from the original purchase date. The lifetime manufacturing warranty remains in effect separately. 

⸻

Important Notes

• Intended for off-road / motorsport use only

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

• The No CEL Guarantee covers check engine lights related to the catalytic converters, not unrelated vehicle faults

• High-flow catalytic converters do not guarantee emissions compliance

• Verify local emissions regulations before purchasing

⸻

Automaz Approved

Looking for increased performance and a more aggressive exhaust note without the concerns associated with traditional aftermarket downpipes?

The MAD 300 CEL Catted Primary Downpipes offer a combination of improved exhaust flow, premium stainless steel construction, and high-flow catalytic converters for the F90 M5 and F9X M8.

What sets these apart is MAD's two-year No CEL Guarantee, making them an appealing option for enthusiasts who want additional performance while retaining catalytic converters.

More power. More sound. No CEL guarantee.

⸻

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.