The 2025+ BMW G90 M5 has redefined what a modern M car can be. Powered by BMW's twin-turbocharged S68 V8, it delivers exceptional performance straight from the factory—but for enthusiasts looking to unlock a more aggressive exhaust character, there's still room for improvement.

The MAD S68 Secondary Catless Downpipes are designed specifically for the G90 M5, replacing the restrictive factory secondary catalytic converters with a high-flow, direct bolt-on solution. The result is a significantly more aggressive exhaust note, improved exhaust flow, and enhanced turbo sound—all while retaining the factory primary catalytic converters to avoid triggering a Check Engine Light.

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A Smarter Way to Upgrade Your Exhaust

Many enthusiasts immediately think of primary downpipes when upgrading their exhaust system. While they offer the largest performance gains, they also commonly require tuning and often trigger a CEL due to the removal of the primary catalytic converters.

Secondary downpipes offer a different approach.

By replacing only the factory secondary catalytic converters, the MAD Secondary Downpipes improve exhaust flow and dramatically increase sound while leaving the emissions-monitoring primary catalysts intact. This allows you to enjoy a more exciting driving experience without the CEL that typically accompanies primary catless downpipes.

For many owners, it's the ideal balance between sound, simplicity, and everyday drivability.

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What You'll Notice Behind the Wheel

The S68 engine already delivers an impressive soundtrack, but the factory exhaust system mutes much of its personality.

Installing the MAD Secondary Downpipes transforms the character of the car with:

• A deeper, more aggressive exhaust tone
• Increased turbo whistle under acceleration
• Reduced exhaust backpressure
• Improved exhaust flow
• A more engaging driving experience without excessive drone

Whether you're accelerating onto the highway or enjoying a spirited backroad drive, the S68 sounds noticeably more alive.

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Built for the G90 M5

Like every MAD exhaust component, these secondary downpipes are engineered specifically for their intended application rather than adapted from a universal design.

Each set features:

• Heavy-duty 304 stainless steel construction with 2.0mm wall thickness
• Precision TIG welding
• Back-purged welds for maximum durability
• Smooth internal transitions to optimize exhaust flow
• OEM-style flanges and mounting points
• Direct bolt-on installation

The result is a component built to withstand high temperatures while providing an OE-quality fit.

Run Them Alone or Pair Them with Primary Downpipes

The MAD Secondary Downpipes work exceptionally well as a standalone upgrade, delivering one of the most noticeable exhaust sound improvements available for the G90 M5.

For owners seeking the ultimate S68 exhaust setup, they can also be paired with MAD Primary Downpipes. Together, they create the most unrestricted exhaust system possible, maximizing exhaust flow while delivering the most aggressive sound the platform has to offer.

This flexibility allows you to upgrade your exhaust in stages or complete the full system all at once.

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Designed for Factory and Aftermarket Exhaust Systems

The MAD Secondary Downpipes are compatible with the factory exhaust as well as most aftermarket cat-back systems, making them an easy addition regardless of your current setup.

Before ordering, be sure to verify your vehicle's flange style or contact the MAD team with your VIN to ensure proper fitment.

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Vehicle Fitment

Compatible with:

• 2025+ BMW G90 M5 (S68)

Please Note: These downpipes are not compatible with the BMW X5, X6, X7, XM, or any other S68-powered X Series models.

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Backed by MAD Quality

Every MAD Secondary Downpipe is developed specifically for the G90 M5 platform and extensively tested to ensure proper fitment, durability, and performance.

Each kit includes:

• Proven platform-specific fitment
• Direct bolt-on installation
• Limited Lifetime Warranty against manufacturing defects

Whether you're building a dedicated performance car or simply want your G90 M5 to sound the way a twin-turbo V8 should, the MAD S68 Secondary Downpipes deliver a substantial improvement without the compromises associated with primary catless downpipes.

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Shop the MAD BMW G90 M5 S68 Secondary Downpipes

Ready to give your S68-powered M5 the aggressive exhaust note it deserves?