Active Autowerke Performance Downpipes — BMW B58N & Ford EcoBoost Upgrades
17th Mar 2026
Active Autowerke BMW B58N M340i M440i AFlow Catted Downpipe (2025 and newer) 11-062GA
Order Link: https://x-ph.com/active-autowerke-bmw-b58n-m340i-m440i-aflow-catted-downpipe-2025-and-newer-11-062ga/
Unlock the full performance potential of your BMW B58N Gen-3 engine with the Active Autowerke Signature AFlow Catted Downpipe, specifically engineered for M340i and M440i (2025 and newer, US models only). Designed to reduce exhaust backpressure, this downpipe improves turbo spool, increases horsepower, and maintains OEM-level emissions compliance using the included Active AFlow high-flow catalytic converter.
The factory B58N Gen-3 downpipe is restrictive, limiting turbo efficiency and exhaust flow. Active Autowerke’s solution utilizes 5” diameter TIG-welded 304 stainless steel piping, tapering down to 80mm to seamlessly connect with the OEM exhaust system. The included Active AFlow catalytic converter is EPA-registered, OBD2 compliant, and designed to operate without triggering a CEL while outperforming stock converters in high-flow and durability.
This bolt-on downpipe combines precision engineering, high-quality materials, and emissions-conscious design to deliver maximum performance with minimal compromise. It’s ideal for enthusiasts seeking increased horsepower, quicker turbo response, and a reliable aftermarket solution.
Key Features & Benefits
- No CEL – optimized catalytic efficiency using the included Active AFlow converter
- EPA-Registered High Flow Catalytic Converter – OBD2 compliant, 49-state legal (not California)
- 5” Diameter Stainless Steel Piping – maximizes turbo output and reduces backpressure
- Quick Turbo Spool – large-volume design enhances boost response
- Rated up to 950 HP – suitable for high-performance forced induction applications
- TIG-Welded 304 Stainless Steel Construction – robust and long-lasting
- Casted Upper V-Band Flange – ensures precise OEM-style fitment
- Ultra High Flow Catalyst – 400 cells per square inch for maximum efficiency
- Operational Efficiency – reaches full catalytic function within 9 seconds of startup
- Durability & Safety – withstands temperatures up to 1500°F, protects occupants from harmful emissions
- Warranty – 5 years / 50,000 miles (shell/tube ends), 2 years / 25,000 miles (catalyst core)
- Made in Miami, Florida
Installation Notes
- Designed for US-spec BMW B58N Gen-3 M340i / M440i (2025+)
- Requires subframe removal; labor time approximately 9–10 hours
- Bolt-on installation, no cutting or welding required
- Professional installation recommended
Active Autowerke B58N Signature Downpipe Benefits
The speed of your turbocharger is limited by exhaust backpressure. Active Autowerke’s 5” signature downpipe relieves this restriction, resulting in quicker spool, improved horsepower, and increased torque. Using the high-flow GESI catalytic converter, emissions are managed without sacrificing performance.
Engineered for daily driveability, durability, and long-term performance, this downpipe offers an affordable, high-quality solution for B58N enthusiasts looking to maximize their vehicle’s potential.
Vehicle Fitment
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BMW M340i / M440i B58N Gen-3 – 2025 and newer (US model only)
Active Autowerke BMW B58N M340i M440i GESI Catted Downpipe (2025 and newer) 11-062G
Order Link: https://x-ph.com/active-autowerke-bmw-b58n-m340i-m440i-gesi-catted-downpipe-2025-and-newer-11-062g/
Maximize the performance of your BMW’s latest-generation turbocharged engine with the Active Autowerke B58N Gen-3 GESI Catted Downpipe, engineered specifically for 2025+ M340i and M440i models equipped with the B58N Gen-3 engine. Designed to reduce exhaust restriction while maintaining emissions efficiency, this downpipe delivers faster turbo spool, increased horsepower, and improved throttle response.
The factory B58N Gen-3 downpipe integrates a restrictive Gasoline Particulate Filter (GPF), limiting exhaust flow and overall performance. Active Autowerke addresses this with a 5-inch diameter 304 stainless steel downpipe, optimized for maximum flow and durability, while tapering to 80mm to seamlessly connect with the OEM exhaust system.
This version features a GESI G-Sport Ultra High Output catalytic converter, providing industry-leading emissions control without sacrificing performance. Fully EPA-registered and OBD2 compliant, the GESI catalyst is designed to eliminate check engine lights (CEL) while supporting builds up to 1,000 horsepower.
Key Features & Benefits
- GESI G-Sport UHO High-Flow Catalytic Converter – EPA registered & OBD2 compliant
- No CEL Guarantee – optimized catalytic efficiency
- 5” Mandrel-Bent 304 Stainless Steel Piping – maximizes exhaust flow
- Quicker Turbo Spool – reduced backpressure improves boost response
- Rated Up to 1,000 HP – ideal for high-performance builds
- TIG-Welded Construction – superior strength and durability
- Casted Stainless Steel V-Band Flange – precise OEM-style fitment
- 400 CPSI High-Flow Catalyst – balances emissions and performance
- Withstands Up to 1500°F – engineered for extreme conditions
- Fast Light-Off Time – reaches operating efficiency in ~9 seconds
- Bolt-On Installation – no cutting or welding required
- Made in USA (Miami, Florida)
Performance Benefits
By significantly reducing exhaust backpressure, this downpipe allows the turbocharger to operate more efficiently. The result is quicker spool, increased horsepower and torque, and smoother power delivery, all while maintaining daily drivability and emissions-conscious performance.
Active Autowerke’s engineering focuses on maximizing airflow with minimal bends, ensuring optimal exhaust velocity and improved engine efficiency without compromising reliability.
Installation Notes
- Fits US-spec vehicles only (fitment not guaranteed for international models)
- Requires removal of factory GPF downpipe
- Subframe must be dropped – installation time ~9–10 hours
- Professional installation strongly recommended
Important Compliance Note
- EPA compliant for 49 states (NOT legal in California)
- Designed for OBD2 vehicles (1996+)
- Warranty may be void if excessive burble tunes are used (can damage catalytic core)
Warranty
- 5 Year / 50,000 Mile Warranty (shell & tubing)
- 2 Year / 25,000 Mile Warranty (catalytic core)
Vehicle Fitment
BMW B58N Gen-3 (2025+ US Models Only)
3 Series (G20 LCI)
- 2025+ BMW M340i
- 2025+ BMW M340i xDrive
4 Series (G22 / G23 / G26)
- 2025+ BMW M440i Coupe
- 2025+ BMW M440i xDrive Coupe
- 2025+ BMW M440i Convertible
- 2025+ BMW M440i xDrive Convertible
- 2025+ BMW M440i Gran Coupe
- 2025+ BMW M440i xDrive Gran Coupe
Active Autowerke 2017–2020 Ford F-150 3.5L EcoBoost AFlow EPA-Compliant Catted Downpipes - 51-001A
Upgrade the performance, efficiency, and turbo response of your truck with the Active Autowerke AFlow EPA-Compliant Catted Downpipes for 2017–2020 Ford F-150 3.5L EcoBoost.
These high-flow downpipes are engineered as a direct replacement for the restrictive factory units, allowing exhaust gases to exit the twin turbochargers more efficiently while maintaining catalytic converters designed to support emissions compliance.
The factory downpipes on the 3.5L EcoBoost are one of the biggest restrictions in the exhaust system. By upgrading to larger-diameter mandrel-bent tubing combined with Active AFlow high-flow catalytic converters, turbo spool improves, exhaust backpressure is reduced, and the engine can produce more horsepower and torque with better efficiency.
This system is ideal for performance builds, daily driven trucks, towing setups, and tuned EcoBoost applications that require both power gains and emissions-conscious design.
Performance Benefits
- Faster turbo spool and improved throttle response
- Increased horsepower and torque potential
- Reduced exhaust backpressure
- Deeper, more aggressive exhaust tone
- Improved efficiency under light throttle conditions
- Supports higher boost and tuned applications
EPA-Compliant Active AFlow High-Flow Catalytic Converters
This version includes a pair of 5-inch Active AFlow super high-flow catalytic converters designed to maintain performance while reducing emissions.
- EPA registered catalytic converters
- OBD2 compliant for 1996+ vehicles
- Designed to prevent catalytic efficiency check engine lights
- Rated for engines up to 950 horsepower
- 400 cell high-flow catalyst design
- Stainless steel substrate with furnace-brazed construction
- Proprietary precious metal loading for reduced emissions
- Fast light-off time for quicker operating efficiency
- Withstands temperatures up to 1500°F
- Ideal for turbocharged and forced-induction engines
Note: Not legal for use on vehicles registered in California.
Federal law prohibits tampering with emissions equipment unless used as a compliant replacement component.
Construction & Design
- 3-inch mandrel-bent tubing for maximum exhaust flow
- TIG-welded 304 stainless steel construction
- Precision CNC-cut turbo flanges
- Integrated flex sections for durability
- High-temperature resistant materials
- Corrosion-resistant stainless finish
- Designed for long-term reliability under high heat and boost
Installation Features
- Direct bolt-on replacement
- No cutting or welding required
- Works with factory turbochargers
- Retains factory O2 sensors
- Compatible with stock exhaust systems
- Compatible with aftermarket cat-back exhaust
- Can be installed with standard tools
Warranty
- 5 Year / 50,000 Mile warranty on shell and tube ends
- 2 Year / 25,000 Mile warranty on catalytic core
- 1 Year warranty on downpipes
- Warranty valid for original purchaser only
- Excessive burble tunes may void catalytic core warranty
Vehicle Fitment
- 2017-2020 Ford F-150 3.5L EcoBoost
Fits 2WD and 4WD models equipped with the second-generation 3.5L EcoBoost twin-turbo engine.
Product Features Summary
- EPA-compliant high-flow catalytic converters
- Active AFlow catalytic technology
- 3-inch high-flow downpipe design
- Faster turbo spool
- Increased power potential
- Stainless steel performance construction
- Direct bolt-on installation
- Compatible with stock or aftermarket exhaust systems
- Designed for turbocharged performance applications
Why Upgrade EcoBoost Downpipes
The downpipes are one of the most restrictive parts of the factory exhaust system on turbocharged engines.
Upgrading to high-flow catted downpipes allows exhaust gases to exit the turbochargers faster, improving turbo efficiency, increasing power output, and enhancing overall driving performance while maintaining catalytic functionality.
These EPA-compliant downpipes provide the perfect balance of power, reliability, and emissions-friendly performance for the 3.5L EcoBoost F-150 platform.
Active Autowerke 2017–2020 Ford F-150 3.5L EcoBoost GESI EPA-Compliant Catted Downpipes - 51-001
Upgrade your twin-turbo 3.5L EcoBoost F-150 with Active Autowerke’s GESI EPA-compliant ultra high-flow catted downpipes. Designed as a direct replacement for the restrictive factory downpipes, these high-performance components improve exhaust flow, turbo response, and overall engine efficiency while maintaining emissions compliance.
Performance Benefits:
- Improved turbo spool and throttle response due to reduced exhaust backpressure
- Increased horsepower and torque potential, especially with supporting mods and tuning
- Enhanced turbo sound and deeper exhaust tone without excessive drone
- Potential fuel efficiency gains under light throttle conditions
EPA-Compliant Ultra High-Flow Catalytic Converters:
- Includes 5" GESI ultra high-flow catalytic converters
- Full 304 stainless steel construction with furnace-brazed substrate
- EPA registered and compliant in 49 states (not CARB legal in California)
- Fully OBD2 compliant, designed for vehicles 1996 and newer
- Rated for engines up to 1,000 horsepower
- Reduced backpressure maximizes horsepower while maintaining emissions compliance
- Active proprietary precious metal loading reduces emissions and minimizes Check Engine Lights
Construction & Design:
- 3-inch mandrel-bent tubing for smooth exhaust flow
- TIG-welded stainless steel construction for durability and corrosion resistance
- CNC-cut turbo flanges for leak-free sealing
- Integrated flex sections to absorb engine movement
- Withstands temperatures up to 1600+°F
- Operational efficiency within 9 seconds of startup
Installation:
- Direct bolt-on replacement, no cutting or welding required
- Compatible with factory turbochargers and exhaust systems
- Retains factory O2 sensors
- Works with stock or aftermarket cat-back exhaust systems
- Fits professional installers and experienced enthusiasts
Vehicle Fitment:
- 2017-2020 Ford F-150 3.5L EcoBoost
- Compatible with both 2WD and 4WD models equipped with the second-generation 3.5L EcoBoost twin-turbo engine
Product Features Summary:
- EPA-compliant high-flow catalytic converters
- 3" mandrel-bent stainless steel tubing
- Faster turbo spool and improved throttle response
- Reduced exhaust restriction and backpressure
- Direct bolt-on replacement for factory downpipes
- Compatible with stock and aftermarket exhaust systems
- Premium TIG-welded stainless steel construction
- Covered by 5-Year/50,000-Mile warranty on shell and tube ends; 2-Year/25,000-Mile warranty on catalytic core
Why Upgrade?
Factory downpipes are a major restriction in EcoBoost turbo systems. Active Autowerke high-flow catted downpipes improve turbo efficiency, exhaust flow, and performance while remaining emissions-compliant. Perfect for performance builds, daily driving, tow rigs, and tuned EcoBoost F-150 trucks.
Ideal For: Performance builds, daily drivers, tow rigs, tuned EcoBoost trucks