Cummins delete kit
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Cummins delete kit
I’m trying to understand the real benefits of deleting my 6.7 Cummins. I know the truck was designed to run with DEF, and I don’t mind the cost of DEF itself. What I’m looking for is an in‑depth explanation of why I should or shouldn’t go with an all in one cummins delete kit and what the long‑term pros and cons are.
Last edited by DeXLMM3500; Feb 25, 2026 at 08:45 AM.
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Joined: Apr 2010
Posts: 87,362
Likes: 4,209
From: Clayton MI
I take it there are no inspections/emissions testing where you are..... Actually, doing the delete, either just part, of the full kit, and driving on the roads, is patently illegal, and if caught, the fines are pretty stiff. That said, I don't know of anyone that has actually been 'caught'..... But, for a short list:
Cons:
It's illegal.
Bad for the environment.
Likely annoy the PCM.
Possibly difficult to get service when you need it. The dealer probably won't touch it, independent shops? Just depends on the shop.
Pros:
A LOT less REALLY EXPENSIVE stuff to fail.
Cheaper to run it. (don't need DEF)
Cheaper maintenance..... See #1
Other:
No clue what it will do to fuel economy..... not like that is much of a concern in a TRUCK.....
If you move somewhere that there ARE inspections, gonna have to put everything back on. Same applies if your local laws change.
Some places are far more **** about such things, and if you get pulled over, will go looking for the stuff they know folks like to remove. (and again, I don't know that this has actually happened to anyone, but, where I live, the "authorities" just don't give a *expletive*....
So, it's really up to you. Personally, I think the government gets FAR to heavy handed with their emissions laws..... but, that's just me.
Cons:
It's illegal.
Bad for the environment.
Likely annoy the PCM.
Possibly difficult to get service when you need it. The dealer probably won't touch it, independent shops? Just depends on the shop.
Pros:
A LOT less REALLY EXPENSIVE stuff to fail.
Cheaper to run it. (don't need DEF)
Cheaper maintenance..... See #1
Other:
No clue what it will do to fuel economy..... not like that is much of a concern in a TRUCK.....
If you move somewhere that there ARE inspections, gonna have to put everything back on. Same applies if your local laws change.
Some places are far more **** about such things, and if you get pulled over, will go looking for the stuff they know folks like to remove. (and again, I don't know that this has actually happened to anyone, but, where I live, the "authorities" just don't give a *expletive*....
So, it's really up to you. Personally, I think the government gets FAR to heavy handed with their emissions laws..... but, that's just me.
Record Breaker
Joined: Sep 2010
Posts: 1,743
Likes: 153
From: Parker, SD
no one should have to talk you into a truck modification, if you cant see the benefits of a modification, don't do it until you see a benefit
The def in no way has any connection to how the motor runs, its not designed to run with def, one could argue motors are designed to run with egr but that's bogus, its like saying engine were built to run without air filters
the only engine design factor that has any real value to the consumer is they're designed to handle higher cylinder(combustion) temps and coolant temps
I'm not sure what year you are dealing with, I would highly consider you look into the grid heater bolt, and if you're post 2019 look into the Hamilton cam swap, two things I would not hesitate spending money on, lots of internet conspiracy over the heater bolt, at the end of the day its and known issue that can happen, how likely is up for debate, when a motor can cost 5 figures and teh guarantee fix costs 3 figures, i l know which way I'm leaning, for the cam swap, we know how well hydraulic lifts work for other motors.... not sure why we could have years upon years of hydraulic lifters in gasoline engines and have nothing more then a possibly cold start tick, now we have massive cam failures.....
The def in no way has any connection to how the motor runs, its not designed to run with def, one could argue motors are designed to run with egr but that's bogus, its like saying engine were built to run without air filters
the only engine design factor that has any real value to the consumer is they're designed to handle higher cylinder(combustion) temps and coolant temps
I'm not sure what year you are dealing with, I would highly consider you look into the grid heater bolt, and if you're post 2019 look into the Hamilton cam swap, two things I would not hesitate spending money on, lots of internet conspiracy over the heater bolt, at the end of the day its and known issue that can happen, how likely is up for debate, when a motor can cost 5 figures and teh guarantee fix costs 3 figures, i l know which way I'm leaning, for the cam swap, we know how well hydraulic lifts work for other motors.... not sure why we could have years upon years of hydraulic lifters in gasoline engines and have nothing more then a possibly cold start tick, now we have massive cam failures.....