Introducing the MAD S58 Catted Downpipes

ETA: August 2026

The perfect upgrade for BMW X3M and X4M owners 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, these downpipes are built to withstand extreme heat and demanding driving conditions. The smooth mandrel-bent design maximizes exhaust flow, resulting in noticeable gains in horsepower, torque, and throttle response.

Equipped with 300 cell high-flow catalytic converters, the MAD S58 Catted Downpipes enhance exhaust sound and overall drivability while keeping the check engine light off. They bolt directly to the factory exhaust system with no cutting or welding required, making installation straightforward and hassle-free. They are also fully compatible with most aftermarket exhaust systems, allowing you to build the setup that best suits your goals.

No CEL Guarantee

If you receive a check engine light related to the catalytic converters, MAD will replace the downpipes free of charge.

Dont settle for stock performance. Upgrade to the MAD S58 300 Cell Race Catted Downpipes and experience the full potential of your BMW X3M or X4M.

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, including cracks in the piping 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 excessive drone

• Up to 30HP increase on stock turbos, with even greater gains on upgraded turbo setups

• Lifetime warranty on defects and fitment

• Ships in 1 to 2 business days

• Spot-on fitment

• Flex section for added durability

NOTE: Downpipe gaskets are not included and must be purchased separately for installation.

Fitment:

• 2020+ BMW X3M F97

• 2020+ BMW X3M Competition F97

• 2020+ BMW X4M F98

• 2020+ BMW X4M Competition F98

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.