2020-2022 Ford 6.7L Powerstroke Downpipes

The downpipe on the 2020-2022 Ford 6.7L Powerstroke

The 6.7L sends its exhaust toward the valley, where the turbo sits between the cylinder banks. The downpipe takes the turbine discharge from there down the back of the engine to the aftertreatment. Since 2015 Ford has used a cobra-head downpipe on this engine, a shape that reduces turbulence and flows more than the earlier pipe. Downstream of it the exhaust passes through the diesel oxidation catalyst, the silicon-carbide DPF and the SCR catalyst with DEF dosing. On these trucks the downpipe is the last piece of plumbing before all of that hardware, and V-band clamps seal its joints.

What goes wrong

The concern in this area is a leak. Exhaust leaks are one known cause of DEF/SCR/NOx faults on the 6.7L, alongside degraded DEF, crystals at the dosing injector and damaged sensor wiring. Those faults set codes like P20EE and P207F and start a countdown to derate, ending in a 5 mph limp if you ignore them. Leaks further up the hot side, at the manifolds and up-pipes, show as a cold-start tick that quiets as the engine warms, soot trails at the flanges and slower spool. When you have the downpipe joint open, look over the whole hot side.

Stock replacement vs. upgrade

On a 2020-2022 truck, the downpipe and its hardware are OEM-style replacement parts, full stop. If you are pulling the downpipe for turbo work, plan the clamp into the job so you are not waiting on a part with the truck apart. If what you really want is more flow and a different sound, the compliant place to get it is behind the aftertreatment. A DPF-back system replaces only the muffler and tailpipe section behind the DPF and SCR, and Banks claims its Monster Exhaust 49795 has 82% less backpressure than stock downstream of the aftertreatment. You will find those systems in our exhaust section.

What we carry

This collection holds Mahle turbocharger downpipe V-band clamps. The B33485 is a 2.5-inch clamp listed for 2011-2022 6.7L trucks. The B33487 is a 3.5-inch clamp listed for 2015-2022 trucks. These are replacement clamps for the factory joints, not performance parts, and they are the piece you want on the bench before the downpipe comes off.

Fitment notes

The B33485 and B33487 each cover every 2020-2022 6.7L model year, but they are different diameters, so match the clamp to the joint you are opening. Neither is listed for 2023 and newer trucks, and the 2023 and newer High-Output engine uses a different turbo, so do not carry these numbers forward to a newer truck without checking. When in doubt, verify by VIN.

Frequently asked questions

Which Mahle clamp does my 2021 F-350 need?

The B33485 (2.5-inch) and B33487 (3.5-inch) are each listed for 2020-2022 6.7L trucks. The difference is diameter, so match the clamp to the joint you are servicing. If you are not sure which one you have, call with your VIN and we will help you sort it out.

How do I get more exhaust flow on a 2020-2022 6.7L?

Not at the downpipe. It feeds the DOC and DPF, and only OEM-style replacements are compliant there. The compliant place is behind the aftertreatment with a DPF-back system; MBRP claims up to 18 hp, 28 lb-ft and up to 200 degrees F lower EGT from its DPF-back alone.

Can a leak at the downpipe cause DEF or SCR codes?

Exhaust leaks are one known cause of DEF/SCR/NOx faults on the 6.7L, along with degraded DEF, crystals at the dosing injector and damaged sensor wiring. Typical codes are P20EE and P207F, followed by a countdown-to-derate warning. Rule out leaks along with the other causes before you start buying sensors.

Not sure what fits? Call the shop at the number in the header, or use the fitment checker on any product page. We install everything we sell.