Enhance your 2025+ BMW M340 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: High-quality 304 stainless steel construction for durability 5-inch diameter offers significant airflow improvement over stock High-flow catalytic converter eliminates fuel smell common with catless downpipes Deeper, aggressive, yet refined exhaust note Noticeable horsepower and torque increases Perfect bolt-on fitment for hassle-free installation Ideal for enthusiasts who want power and sound without compromise