Introducing the MAD S58 Catted Downpipe
The perfect upgrade for BMW enthusiasts looking to unlock more performance and a deeper, more aggressive exhaust note without triggering a check engine light.

Crafted from high-quality 304 stainless steel, this downpipe is built to handle extreme heat and harsh driving conditions. The smooth piping transitions are designed for maximum exhaust flow, delivering noticeable gains in horsepower, torque, and throttle response.

Equipped with 300 cell high-flow catalytic converters, the MAD S58 Catted Downpipe improves engine sound and overall drivability while keeping the check engine light off. It bolts directly to the factory exhaust system with no cutting or welding required, making installation quick and hassle-free. It’s also fully compatible with most aftermarket exhaust systems, giving you the freedom to customize your build.

No CEL guarantee
If you get a check engine light related to the catalytic converter, MAD will replace the downpipe for free.

Don’t settle for stock performance. Upgrade to the MAD S58 300 Cell Race Catted Downpipes and experience the full potential of your BMW.

Warranty coverage

• The "No CEL" guarantee is valid for 2 years from the date of purchase.

• The lifetime warranty still applies in cases of manufacturer defects, such as cracks in the pipe or welds.

Race use only

Features

• 300 CEL catalytic converters

• No check engine light guarantee

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

• Smooth bends for maximum airflow without drone

• Up to 30HP increase on stock turbos, even more with upgraded setups

• Lifetime warranty on defects and fitment

• 90-day return period

• Ships in 1 to 2 business days

• Spot-on fitment

• Flex section for added durability

Fitment

• 2021 and up BMW M3 G80

• 2021 and up BMW M4 G82 and G83

• 2023 and up BMW M2 G87

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 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.