Can You Delete an EGR While Keeping the DPF?

There seems to be a lot of confusion among customers, and even some "tuners," about whether it's possible to remove an EGR (Exhaust Gas Recirculation) valve while still retaining a functioning DPF (Diesel Particulate Filter).

What Are the Issues?

Issue 1: Regeneration Failure
Any ECU that controls a particle filter relies on specific conditions to trigger its regeneration strategies. If the EGR removal process is automated or untested, it could prevent the DPF from regenerating properly, leading to blockage. The DPF regeneration process is monitored by several PIDs, and if any of these are disrupted, regeneration will fail.
Some ECUs have Reediness codes, if they report EGR Not working, you aren't ever going to get the DPF to regen!

Issue 2: Increased DPF Load
Deleting the EGR can lead to higher emissions, placing additional strain on the DPF. This could accelerate the rate at which the DPF becomes clogged, further complicating its regeneration.

Issue 3: Impact on Engine Performance
The EGR is designed to reduce NOx emissions by lowering the oxygen content in the engine, particularly at idle. Many EGR delete solutions fail to account for necessary fuel adjustments, which can result in the engine running too rich or too lean. A random AFR or an uncorrected one post EGR delete could raise exhaust gas temperatures (EGTs), potentially damaging the engine and turbo, and increasing soot production, which in turn adds to the DPF's load.

Conclusion
Can you remove the EGR while keeping the DPF? It depends on the engine's ECU and how the modification is done.
As a general rule, NO, and for a long time I wouldn't do an EGR delete without a DPF off too, as I didn't want to come backs.

But if the implications of the modification are understood and its actually tested then I see no issue. But that really is a big BUT

Do you really think a bloke operating on your drive way understands this? I think not