2017–2020 Ford F-150 3.5L AFlow EcoBoost EPA-Compliant Catted Downpipes

Upgrade the performance and efficiency of your twin-turbo F-150 with our AFlow EPA-compliant super high-flow catted downpipes, engineered specifically for the 2017–2020 Ford F-150 3.5L EcoBoost. Designed as a direct replacement for the restrictive factory downpipes, this upgrade improves exhaust flow, enhances turbo response, and delivers noticeable gains in performance while maintaining catalytic converters that support emissions compliance.

The factory downpipes on the EcoBoost platform are a major restriction in the exhaust system. By replacing them with larger-diameter mandrel-bent tubing and super high-flow catalytic converters, exhaust gases exit the turbochargers more efficiently—helping the turbos spool faster and reducing exhaust backpressure.

Performance Benefits

Our catted downpipes are engineered to unlock the true potential of the EcoBoost platform while retaining catalytic functionality.

Key improvements include:

• Improved turbo spool & throttle response – Reduced backpressure allows the twin turbos to reach boost quicker.

• Increased horsepower and torque potential – More efficient exhaust flow supports higher power levels, especially when paired with tuning and supporting mods.

• Enhanced turbo sound and deeper exhaust tone – A more aggressive sound without excessive drone.

• Potential fuel efficiency improvements under light throttle conditions due to reduced restriction.

Whether you’re building a street truck, tow rig, or weekend performance F-150, these downpipes provide the ideal balance of power, durability, and emissions-conscious design.

EPA-Compliant Super High-Flow Catalytic Converters

This variant includes a pair of 5" high flow Active AFlow catalytic converters that will NOT produce a CEL!

The Active AFlow Super High Output Catalytic Converter features full 304 stainless steel construction, including the substrate. Active AFlow Catalytic Converters are EPA registered and compliant in 49 states and fully OBD2 compliant, perfect for use on 1996 and newer vehicles. Active proprietary precious metal loading technology ensures greatly reduced emissions, eliminating most "Check Engine Lights". These high flow catalytic converters outperform stock converters and provide a reliable solution to the most common catalytic converter problems.

The Active AFlow Catalytic Converters are rated for engines putting out up to 950 horsepower while maintaining a high flow capacity. The reduced back-pressure from this high flow catalytic converter will allow you to maximize your engines horsepower without the harmful emissions. Say goodbye to Check Engine Lights and failed emissions tests!

Please Note: These catalytic converters are not legal for use on vehicles registered in the state of California as a result of California Vehicle Code Section 27156 and 38391.

NOTE: Federal law prohibits the tampering of an emissions control device. Mobile Source Enforcement Memorandum 1A, allows for aftermarket parts to be used in the repair or replacement of emissions control systems, provided the emissions aren't adversely affected. There is no mention or reference to cell density or converter volume dimension. The Active AFlow catalytic converter will produce emissions that will meet the standards set by the EPA, not CARB.

Features:

• NO CEL for catalytic efficiency when using this downpipe

• Active AFlow EPA registered high flow and fully OBD2 compliant

• 3" diameter piping allows for maximum power output 

• Quicker turbo spool

• Rated for up to 950 hp applications 

• Withstands up to 1500+ F

• Can reach operational efficiency within 15 seconds of startup

• Easily bolts-on no cutting or welding required

• Durable construction from TIG welded 304 stainless steel

• Precise fitment

• Ultra high flow 400 cell per square inch catalyst

• EPA compliant for use on OBD2 vehicles (1996 and newer) except in California

• 304 stainless steel substrate is furnace braised to the mantle for outstanding durability

• Active proprietary precious metal loading technology ensures greatly reduced emissions

• Ideal for Forced Induction Applications with no loss of HP

• Both passengers and drivers are safe from harmful emissions and noise

• Covered by 5 Year / 50,000 Mile Warranty (on shell and tube ends) and 2 year / 25,000 Mile Warranty on the Catalytic core to original purchaser only - NOTE: warranty will be null and void if your car has excessive burble (greater than stock) as that physically destroys the catalytic core. The downpipe carries our normal 1 year warranty.

• Designed and assembled in Miami, Florida

Premium Construction

Durability and precision engineering are critical in turbocharged exhaust components. These downpipes are constructed from high-quality materials designed to withstand extreme heat and pressure.

Construction features include:

• 3-inch mandrel-bent tubing for smooth exhaust flow

• TIG-welded stainless steel construction for corrosion resistance and strength

• Precision CNC-cut turbo flanges for leak-free sealing

• Integrated flex sections to absorb engine movement and prevent stress fractures

• High-temperature coatings or stainless finish for long-term durability

Direct Bolt-On Installation

These downpipes are designed as a direct replacement for the factory units, requiring no cutting or fabrication.

Installation highlights:

• Direct bolt-on design

• Compatible with factory turbochargers and exhaust system

• Retains factory O2 sensors

• Compatible with stock or aftermarket cat-back exhaust systems

Most installations can be completed with standard tools, making this an excellent upgrade for both professional installers and experienced enthusiasts.

Vehicle Fitment

Compatible with:

• 2017 Ford F-150 3.5L EcoBoost

• 2018 Ford F-150 3.5L EcoBoost

• 2019 Ford F-150 3.5L EcoBoost

• 2020 Ford F-150 3.5L EcoBoost

Fits 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" high-flow mandrel-bent tubing

• Faster turbo spool and improved throttle response

• Reduced exhaust restriction and backpressure

• Stainless steel performance construction

• Direct bolt-on replacement for factory downpipes

• Compatible with stock or aftermarket exhaust systems

Why Upgrade Your EcoBoost Downpipes?

The downpipes are one of the most restrictive sections of the factory exhaust system on turbocharged vehicles. Upgrading to high-flow catted downpipes allows exhaust gases to exit the turbochargers more efficiently, improving turbocharger efficiency and overall engine performance.

For enthusiasts seeking a balance between power gains, reliability, and emissions compliance, EPA-compliant catted downpipes are one of the most effective bolt-on upgrades for the 3.5L EcoBoost platform.

✅ Ideal for:

Performance builds • Daily drivers • Tow rigs • Tuned EcoBoost trucks