MAD Catted Downpipes W/ No CEL Guarantee & Flex Section - BMW / S58 / G80 / G82 / G83 / G87 / M2 / M3 / M4 | MAD-121

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
• Ships in 1 to 2 business days
• Spot-on fitment
• Flex section for added durability

NOTE: Downpipe gasket is not included. Part # 18308053348 qty 2 is required for installation.

⚠️CALIFORNIA WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

• Shipping & Returns