FITMENT

• 2020-2024 Ford Powerstroke F-250 / F-350 / F-450 Super Duty Diesel Pickup Truck
• Note: This is a 4" downpipe. It connects the turbocharger outlet to the mid-section exhaust.

DESCRIPTION

Product Overview

• Many truck owners remove the DPF only to find their turbo response still lags. The culprit? The factory 20+ downpipe features a heavily crimped, flat section to clear the crossmember, which pinches the exhaust flow down to 3 inches or less.
  
• This premium 4" SS Downpipe replaces that pinched factory restriction with a uniform, mandrel-bent 4-inch structure straight from the turbo exhaust housing.
• It eliminates the #1 remaining restriction in your exhaust path, unleashes instantaneous VGT turbo response, and drives down hazardous exhaust heat.

Key Features

• Heavy-Duty T409 SS Build: Engineered from rugged T409 stainless steel to withstand intense thermal shocks, underhood heat cycles, and harsh road salt.
• Eliminate Crimped Bottleneck: Replace the flattened factory pipe. The uniform 4" diameter ensures unrestricted exhaust velocity from the turbo outlet to the tailpipe.
• Faster Turbo Spool: Clear out backpressure directly at the turbine wheel. This allows the turbo to shed spent air instantly, which reduces turbo lag and delivers snappier throttle response.
• Lower EGTs When Towing Heavy: Prevent exhaust heat from trap against the engine block. The high-flow design evacuates hot gases rapidly to lower EGTs significantly under heavy trailer loads.

FAQ

Q: I already installed a DPF delete pipe. Why do I need to upgrade to this 4" Downpipe?

A: Because factory downpipe is the new bottleneck. To clear the frame, Ford flattened a section of the stock pipe down to under 3 inches. Even with the DPF gone, exhaust still chokes at this narrow pinch point. Upgrading to this 4" Downpipe creates a true, uniform 4" path for maximum efficiency.

Q: Can I install this 4" downpipe if I want to keep my factory DPF emissions system intact?

A: Yes, you can. If factory downpipe is rusted or cracked, this serves as a heavy-duty, high-flow replacement that bolts directly into the stock emissions canister. No delete tuner is required if you retain the factory DPF setup.

Q: Will this 4" downpipe trigger a Check Engine Light (CEL) on my dash?

A: If connect it to a stock factory DPF system, it will not throw codes. However, if you use it to run a full DPF delete setup, you must flash truck with a proper delete tuner like our Mini Maxx Tuner V2 to disable the emission sensors permanently.

Q: Which delete pipe should I buy to pair with this 4" Downpipe for a complete turbo-back system?

A: This downpipe connects perfectly to any DP-Back Exhaust pipe. To build a complete high-flow system from the turbo all the way to the exhaust tip, pair this downpipe with match options: 17-22 4" DP-Back or 5" DP-Back Exhaust.