Description
Unlock the true performance potential of your BMW with the MAD BMW B58 2025+ Gen 3 M340 5" 200 Cell Catted Downpipe (Part Number: MAD-128). Designed for enthusiasts who demand power, refinement, and street drivability, this premium downpipe is constructed from high-grade 304 stainless steel and features a 5-inch diameter for significantly improved exhaust flow.
Engineered with a high-flow catalytic converter, this system reduces the fuel odor associated with catless setups while maintaining a powerful, deep exhaust note. The result is an aggressive yet clean tone that enhances your driving experience without compromising emissions compliance.
Perfect for both street and occasional track use, this catted downpipe delivers noticeable gains in horsepower and torque, improved turbo spool, and a more responsive throttle—while remaining easy to install thanks to its direct bolt-on design.
Fitment:
- Fits 2025+ BMW M340i models equipped with the Gen 3 B58 engine.
- Models include: BMW G20 M340i and G21 M340i Touring, production years 2025 and newer.
Key Features:
- Made from premium 304 stainless steel for long-lasting durability
- Large 5-inch diameter increases airflow over stock for more power
- Integrated high-flow catalytic converter for improved emissions and reduced fuel odor
- Produces a deeper, sportier exhaust note without harshness
- Direct bolt-on fitment — no cutting or welding required
- Optimized for both street performance and track reliability
- Engineered and built by MAD for the Gen 3 BMW B58 engine
