Active Autowerke GESI Catted Downpipe - B58N M340i/440i

Product Details

For the owner of a brand new 2025+ M340i or M440i, Active Autowerke provides a "no-compromise" performance upgrade that prioritizes durability and emissions compliance. This downpipe features an integrated GESI G-Sport catalytic converter, which is EPA-registered and fully OBD2 compliant (excluding California). These high-flow units use proprietary precious metal loading to reduce harmful emissions and eliminate the raw fuel odors common with "catless" systems. The 400-cell stainless steel substrate is furnace-braised to the mantle for outstanding resistance to vibration and thermal shock, ensuring that your performance gains remain trouble-free over the life of the vehicle.

Key Features:

• 49-State Legal: EPA-registered and fully OBD2 compliant (Excludes California).

• Cast V-Band Flange: Precision-casted upper stainless steel V-band for a factory-perfect, leak-free seal to the turbocharger.

   

• Fast Light-Off: Reaches operational efficiency within just 9 seconds of startup, satisfying factory emissions monitors.

   

• Industrial Grade Materials: Full 304 stainless steel construction ensures maximum resistance to heat and corrosion.

• Warranty Protected: Covered by a 5-year/50,000-mile structural warranty and a 2-year/25,000-mile catalyst core warranty.*

   

Specifications:

• SKU: 11-063N

• Construction: TIG-welded heavy-gauge 304 Stainless

   

• Catalyst Size: 4.5" Diameter High-Flow Core

   

• Power Capacity: Engineered for high-output setups (up to 850 HP)

   

• Compatibility: Integrates with factory O2 sensors and mounting points

• Vehicle Fitment: * 2025+ BMW M340i / M340i xDrive (G20)

  • 2025+ BMW M440i / M440i xDrive (G22/G23/G26)

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