Description
The MAD BMW S58 Catted Downpipes are engineered for BMW X3M and X4M owners who want a serious performance upgrade with improved exhaust flow, sharper throttle response, and a more aggressive exhaust tone—without triggering a check engine light.
Built from premium 304 stainless steel, these downpipes are designed to handle extreme heat and high-performance driving conditions. The mandrel-bent construction ensures smooth exhaust flow, reducing restriction and helping unlock gains in horsepower and torque.
These downpipes are equipped with 300-cell high-flow catalytic converters, delivering a strong balance between performance and drivability. They are designed for a direct bolt-on installation, requiring no cutting or welding, and are compatible with most factory and aftermarket exhaust systems.
A built-in flex section adds durability by reducing stress on the piping during engine movement and thermal expansion, improving long-term reliability.
MAD also offers a No CEL Guarantee: if you receive a check engine light related to the catalytic converters, the product will be replaced free of charge within the warranty terms.
Key Features
- 300-cell high-flow catalytic converters
- No Check Engine Light (CEL) guarantee
- Constructed from high-quality 304 stainless steel
- Mandrel-bent piping for maximum exhaust flow
- Flex section for added durability and reduced stress
- Direct bolt-on installation (no cutting or welding required)
- Compatible with most OEM and aftermarket exhaust systems
- Compatible with left-hand drive and right-hand drive vehicles
- Estimated power gains up to +30HP on stock turbo setups (higher on upgraded turbo setups)
- Spot-on fitment and track-proven design
- Ships within 1–2 business days
Warranty Coverage
- No CEL Guarantee is valid for 2 years from the date of purchase
- Lifetime warranty applies to manufacturer defects, including cracks in piping or welds
Installation 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
Race Use Only / Emissions Disclaimer
This product 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 are not liable for improper or unlawful use of this product
- Installation or use on public roads, highways, or streets may violate the Federal Clean Air Act (42 U.S.C. § 7522) and applicable state laws
- You should verify local laws before purchasing and installing this product
