Take your BMW G90 M5 to the next level with the MAD Secondary Catless Downpipes. Designed specifically for the latest S68-powered M5, these downpipes deliver a more aggressive exhaust with improved airflow.
Unlike primary downpipes, the secondary downpipes provide a straightforward way to increase exhaust flow and enhance sound without replacing the primary catalytic converters.
MAD Secondary Catless Downpipes
The Secondary Downpipes replace the factory secondary catalytic converters, providing a simple way to improve exhaust flow and dramatically enhance the sound without triggering a Check Engine Light (CEL).
Because the factory primary catalytic converters remain in place, the vehicle continues to monitor emissions normally, making the secondary downpipes an excellent upgrade for owners who want a louder, more aggressive exhaust while avoiding the CEL typically associated with primary catless downpipes.
Benefits include:
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No Check Engine Light (CEL)
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Improved exhaust flow
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Reduced exhaust backpressure
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Deeper, more aggressive exhaust tone
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Increased turbo whistle
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Direct bolt-on installation
Install either individually or combine both for the ultimate S68 exhaust setup. The primary downpipes deliver the largest performance gains, while the secondary downpipes provide a significant sound improvement with the added advantage of remaining CEL-free. Together, they create the most unrestricted exhaust system possible for the G90 M5.
Enhanced Driving Experience
These secondary downpipes noticeably transform the character of the S68 engine.
Expect:
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Deeper, more aggressive exhaust tone
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Increased turbo whistle
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Improved exhaust flow
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Better overall sound without excessive drone
Precision Construction
Each downpipe is manufactured from heavy-duty stainless steel for maximum durability and heat resistance.
Features include:
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Precision TIG welding
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Back-purged welds for maximum strength
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Smooth internal transitions for optimal exhaust flow
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OEM-style flanges and mounting points
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Direct bolt-on installation
Why Choose MAD?
Unlike universal alternatives, the MAD Secondary Catless Downpipes were engineered specifically for the BMW G90 M5 S68 platform and extensively tested for fitment and performance.
Every MAD Secondary Downpipe is backed by:
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Limited Lifetime Warranty against manufacturing defects
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Proven fitment and performance testing
Highlights
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Catless secondary downpipes
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More aggressive exhaust tone
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Increased turbo sound
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Improved exhaust flow
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Reduced exhaust backpressure
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Heavy-duty 304 stainless steel construction (2.0mm wall)
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TIG welded and back-purged
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Direct bolt-on installation
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Limited Lifetime Warranty
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Compatible with factory and most aftermarket exhaust systems
Fitment
Compatible with:
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BMW G90 M5 (2025+) – S68
Note: Does NOT fit the X5, X6, X7, XM, or any other S68-powered X Series models.
Notes
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Check your vehicle for the correct flange style or email us your VIN before ordering.
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Compatible with both factory and aftermarket exhaust systems.
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:
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You are responsible for complying with all applicable federal, state, and local emissions laws.
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MAD and its affiliates disclaim all liability for improper or unlawful use of this product.
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Use of this product on pollution-controlled vehicles operated 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 purchasing or installing this product.
