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MAD BMW B58 2025+ Gen 3 M340 M440 5" 200 Cell Catted Downpipe
Enhance your 2025+ BMW M340 & M440 with the MAD BMW B58 Gen 3 5" 200 Cell Catted Downpipe—engineered specifically for performance enthusiasts seeking a cleaner and refined upgrade. Built with premium-quality 304 stainless steel and equipped with a high-flow catalytic converter, this downpipe delivers impressive power gains, increased airflow, and quicker turbo response without the typical fuel smell of a catless design.
Enjoy a deeper, richer, and more aggressive exhaust note compared to your stock setup, but with a refined tone that's smoother and cleaner than catless options. The MAD catted downpipe strikes the ideal balance between noticeable performance gains and everyday drivability, ensuring reliability and comfort for street and track use alike.
Precision welds, exceptional craftsmanship, and direct bolt-on installation make this downpipe an essential upgrade for your BMW, providing maximum benefits without compromising convenience.
Features:
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High-quality 304 stainless steel construction for durability
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5-inch diameter offers significant airflow improvement over stock
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High-flow catalytic converter eliminates fuel smell common with catless downpipes
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Deeper, aggressive, yet refined exhaust note
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Noticeable horsepower and torque increases
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Perfect bolt-on fitment for hassle-free installation
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Ideal for enthusiasts who want power and sound without compromise
Fitment:
Does not fit euro models (check downpipe flange design before ordering)
2025+ BMW M340
2025+ BMW M440
2025+ BMW X3 G45 M50
2025+ BMW X4 G46 M50
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:
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You are responsible for compliance with all applicable emissions laws and regulations.
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MAD and its affiliates disclaim any liability for improper or unlawful use of this product.
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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.