6.7 Cummins DPF Delete Guide (2022)

The 6.7 Cummins diesel engine was introduced in 2007.5 as a replacement to the 5.9L due to tightening emissions regulations. Since then, emissions regulations have continued to tighten and various new systems have been added to the 6.7 Cummins. One of the reasons the old diesels remain so popular and expensive today is because they don’t have any of these modern emissions systems which tend to be problematic and very expensive to repair.

One of the new emissions systems added to the 6.7 Cummins is a diesel particulate filter, or DPF system. The DPF system has hung around since then and is still used in current Cummins engines.

While the diesel particulate filter and all the other emissions equipment is very good at reducing emissions, it also has its shortcomings. As we discussed in our 6.7 Cummins common problems guide, the DPF system is prone to clogging. Additionally, since it is part of the exhaust system it creates a lot of post-turbo backpressure which decreases turbo reliability and restricts performance. Lastly, when it does fail it costs about $2k-$3k to replace.

This guide is going to specifically cover the DPF system. We’ll discuss what the system is, how it reduces emissions, and the pros and cons of deleting the DPF system. If you want to read up on the various other systems, check out our guide on all 6.7 Cummins emissions systems.

What is a 6.7 Cummins DPF System?

DPF is a diesel particulate filter. Burning diesel fuel releases microscopic solid particles into the exhaust gas, commonly referred to as diesel particulates. These small, solid particles contain hundreds of different chemicals in them and are harmful to human health. The particulates can stick to your lungs and are carcinogens.

Diesel engines have oxidation catalysts, called DOCs, that function like normal catalytic converters. This helps clean exhaust gases, but it doesn’t capture these solid particulates. Enter the DPF, or diesel particulate filter.

DPF filters trap these particulates, commonly referred to as diesel soot. It looks like a catalytic converter and uses the same honeycomb internal structure but is made of ceramic materials. This honeycomb mesh structure captures the soot and then burns it into a harmless ash through a regeneration process.

Regeneration occurs in both passive and active cycles. When EGTs (exhaust gas temps) reach 950-degrees Fahrenheit or higher, the DPF soot naturally burns through passive regeneration. However, since exhaust gas temps don’t always get that hot, active regeneration needs to occur to clear out the filter. During active regeneration, diesel fuel is injected into the exhaust stream which heats up the exhaust gases as they pass through the DOC and then burns the DPF soot.

(Video) 6.7 cummins EGR/DPF delete kit part 1

DPF System Changes

For 2007.5 through 2012 model years, the DPF system was separated from the DOC system. The DOC catalyst was integrated in the downpipe which was followed by the DPF piping. In 2013 the DOC was removed from the downpipe and integrated with the DPF filter.

Therefore, deleting a 2013+ DPF system will also delete the DOC. However, if you want to delete the DOC for 2012 or prior, you need to upgrade the 6.7 Cummins downpipe.

EGR Deletes

One other critical emissions component is the EGR system. EGR has been on the 6.7 Cummins since 2007.5. The EGR system includes a valve and a cooler. It takes exhaust gases and recirculates them back through the intake manifold and into the combustion chamber. This causes the gases to be reburned therefore reducing the amount of emissions byproducts.

The downside of the EGR system is that it recirculates dirty air back into your engine. This creates a build up of diesel soot which can clog the EGR valves, and cause the EGR and its cooler to fail, resulting in an expensive repair. Additionally, it decreases gas mileage and restricts performance.

Deleting the DPF system does not remove the EGR system. EGR needs to be deleted separately. It is a bit more complicated since it isn’t just a few exhaust pipes, but it’s still a pretty easy DIY. You will however need to purchase either a complete delete kit (see below) or purchase the EGR delete separately.

2007.5-2009 6.7 Cummins EGR Delete Kit
2010-2020 6.7 Cummins EGR Delete Kit

6.7 Cummins DPF Delete Benefits

There are two primary reasons for deleting the DPF system on the 6.7 Cummins. First is for performance purposes. Since the DPF system is part of the exhaust, it creates a lot of backpressure which detracts from performance potential. Secondly, the DPF system is prone to clogging and costs $2k+ to replace when it clogs.

  • 15-30hp and 50-100wtq gains depending on your tune
  • 2-5mpg improvements
  • Less exhaust backpressure
  • Improved turbo efficiency and reliability
  • No more regen cycles
  • Reduced maintenance and repair costs

Power gains and mpg improvements will vary depending on what year your 6.7 Cummins is and what tune you are running. If you don’t delete the DOC catalyst in the downpipe on older models then you likely will experience a lot less power gains since the DOC sits right behind the turbo.

(Video) How to: Installing Flo-Pro DPF Delete Pipes on 2016 6.7 Cummins

The fuel mileage improvements come primarily from eliminating the need for active regeneration which shoots fuel directly into the exhaust stream. The other benefits are improved reliability from the turbo due to less backpressure and piece of mind knowing you aren’t going to clog your DPF and be out $2k-$3k in repair costs.

6.7 Cummins DPF Delete Cons

While deleting the DPF sounds good for the mileage and power gains, it isn’t all sunshine and rainbows. The EPA has been cracking down on emissions deletes so finding anyone to install one for you or work on your truck after its installed is becoming very difficult.

  • Reduced resale value
  • Must sell private party
  • Voids factory warranty
  • It is illegal
  • Increases pollution and is harmful to the environment
  • Requires a tuner
  • Will fail inspections

The majority of the downsides of a DPF delete revolve around the fact that it is illegal. The dealership definitely won’t touch your truck and nowadays a lot of independent shops won’t be willing to work on it either.

Outside of the legality, it reduces resale value of your truck, is harmful to the environment, and requires a tuner which adds to the cost of deleting the system.

Should You Delete Your DPF System?

Honestly, unless you are chasing crazy power goals or using your truck purely for off-road applications then we don’t recommend deleting your DPF system. Some states will send your truck straight to the crusher if it’s caught with deleted emissions systems.

It creates so much more headache than necessary. If you want some power gains, drop an intake and tune on your 6.7 Cummins. Plus there are plenty of additional mods for the power hungry. Furthermore, you can get some nice MPG gains as well through a tuner and an intake.

I understand the cost of replacing the DPF if it clogs is scary, but a DPF delete isn’t going to be a ton cheaper. Also, Cummins has an 8yr 80,000 mile warranty on the DPF system.

Overall, it’s up to you and your willingness to put up with the headache of having an illegal car that no one will touch. But we just don’t think it’s necessary unless you are really trying to put down massive power numbers. These engines have already proved plenty capable with basic bolt-on mods.

(Video) 6.7 Cummins EGR Delete /Mini Maxx install / It Really Is Easy

How to Delete your 6.7 Cummins DPF

If you do need or want to delete your DPF system, there are a few components. First, you will need a DPF delete kit. Second, you will need a proper DPF delete tune.

While deleting these exhaust components mostly just requires bolting up some new piping, keep in mind that you won’t be able to find a shop to do it. You will need to either DIY a delete or pay someone under the table to do it as shops will not risk the potential fines.

DPF Delete Kits

As we mentioned above, 2013+ models have the DOC integrated into the DPF. Therefore deleting the DPF also deletes the DOC. For 2012 and earlier models the DOC has to be deleted separately, via an upgraded downpipe. If you want to maximize power gains and gas mileage, you’ll want to remove the oxidation catalyst in addition to the diesel particulate filter. Since the DOC bolts directly to the turbo, it is a lot more restrictive than the DPF system on pre-2013 engines.

Regardless of the year all DPF delete kits also delete the SCR system. The benefit of removing the selective catalytic reduction piping is that you no longer have to fill up on DEF fluid. Additionally, if you are going to remove one of these systems you might as well remove all of them.

A DPF delete kit is simply a straight pipe that replaces the stock DPF and SCR piping. There are turbo-back options for earlier models with the separated diesel oxidation catalyst.

Best DPF Delete Kit: Diesel Dudes Complete 6.7L Cummins Delete Kit

Diesel Dudes offers a complete delete package that includes an EFI Live tuner with pre-loaded delete tunes, 4″ piping for the DPF & Cat delete, and an EGR delete as well. This option provides everything you need to delete both the DPF and EGR system. Additionally, the delete pipes and tunes are sold separately as well if you don’t want the EGR delete. For 2007.5-2012 models you can get a DPF delete with a full exhaust system. Only the delete piping is available for 2013+ models right now.

Buy the full kits and individual delete pipes here:

2007.5-2018 Complete Kits: 6.7 Cummins Full Delete Kit
2007.5-2012: Delete Pipe Only & 5″ Full Exhaust Delete
2013-2018: Delete Pipe Only
2019-2021: Delete Pipe Only

(Video) Dodge Cummins 6.7L EGR Delete Full Install 2010-2020

A DPF Capable Tuner

The second necessary component for a DPF delete is a tuner. Only certain tuners can handle DPF deletes off the shelf so keep that in mind as you pick a tuner. While just about any tuner will work with a custom DPF delete tune, only a handful of devices come with pre-built off the shelf DPF tunes. With that being said, finding a tuner that comes pre-loaded with delete tunes is becoming very challenging. The only reputable reseller we are aware of is Diesel Dudes, who still sell tuners with pre-loaded tunes.

All these various emissions systems have numerous sensors and electronic components that send signals to the 6.7 Cummins ECM.Deleting the DPF system without a tuner will cause the engine to run extremely poorly. Additionally, reducing all the post-turbo backpressure without properly tuning boost levels can cause the turbo to over spin and fail.

The two best delete tuners are EFI Live and the H&S Mini Maxx. EFI Live is the more robust and best option on the market, but the Mini Maxx works just fine if you are looking for a more budget friendly option.

Buy here to get the tuners with pre-loaded delete tunes:

Note that if you buy these tuners from other retailers, they likely will not come with the delete tunes pre-loaded.

6.7 Cummins DPF Delete Summary

Overall, deleting the DPF and other emissions systems sounds like a really good idea. It prevents clogged filters, reduces maintenance costs, improves performance, and increases gas mileage.

However on the other hand it makes your truck illegal so that it won’t pass inspection, it hurts resale value, it’s bad for the environment, and most shops won’t touch your truck for repairs anymore.

So should you delete your 6.7 Cummins DPF system? We honestly don’t recommend it unless you really need to for extremely high performance applications. The DPF filter has an 8yr/80,000 mile warranty. And on top of that these trucks are still capable of producing power gains in excess of 200rwhp with all of the stock emissions systems still intact.

(Video) 6.7 Cummins EGR Delete (You don't have to be a mechanic)

If you want to delete it for gas mileage purposes, you can also drop an intake and a tune onto the car for some MPG gains without hurting factory warranty or making your truck illegal. Again, it just creates way more hassle than it is worth unless you absolutely need it deleted for performance purposes.


What all do I need to delete my 6.7 Cummins? ›

If you do need or want to delete your DPF system, there are a few components. First, you will need a DPF delete kit. Second, you will need a proper DPF delete tune. While deleting these exhaust components mostly just requires bolting up some new piping, keep in mind that you won't be able to find a shop to do it.

How much horsepower do you gain from a DPF Delete? ›

In many cases, a proper DPF delete will result in gaining over 100-horsepower while improving your fuel mileage and the lifetime of your vehicle.

Does a DPF Delete give more power? ›

When you remove the DPF, fuel flows better into the engine, boosting power generation and pressure. DPF delete is a sure way to increase engine horsepower.

Do you need a programmer for DPF Delete? ›

Registered. If you leave the DPF on and try to stop the regens, the dpf will clog up and kill your motor. If you want to stop the regens you will HAVE TO DELETE THE DPF or risk screwing up your engine. You will also need a tuner/programmer to do this without harming your engine.

What happens if you get caught with a deleted diesel? ›

The cases can also be civil and criminal matters if the removal/tuning has been done often enough or on a large enough scale. The fines can quickly get out of hand, as the EPA has the right to assess civil penalties of $37,500 per day for significant issues and up to $7,500 per day for minor ones.

Can I tune my Cummins without deleting? ›

Registered. Simple answer yes, but your powertrain warranty is for the most part toast once you load a tune. Considering a vast majority of issues with these trucks are related to the emissions components just be prepared to shell out for repairs if needed.

Does removing DPF cause problems? ›

Removing the filter doesn't affect the car's performance, and some motorists even state they achieve better fuel economy and engine performance without one.

What is the penalty for deleting DPF? ›

Here is the specific fine from the EPA if you are caught with DPF delete: Violators are subject to civil penalties up to $45,268 per non-compliant vehicle or engine, $4,527 per tampering event or sale of the defeat device, and $45,268 per day for reporting and recordkeeping violations.

Is removing DPF a good idea? ›

If you are suffering regular problems with your diesel particulate filter, then a removing or deleting your DPF may be something you have considered, but you should not. And here's why: The main reason not to carry out a DPF delete is that when your vehicle is due for an MOT test, it will fail (if tested correctly).

Does DPF Delete increase mpg? ›

Removing your DPF will make a bigger difference, depending on your engine, around +10% power increase, and also less fuel consumption.

Does DPF removal cause smoke? ›

In most cases, the automated software won't delete these parts of the file, but then leaving part of the DPF file in place will also bring problems such as the vehicle falling back into limp mode, the DPF light coming back on, excessive smoke and as a result of this, an MOT Failure.

Does drilling holes in DPF work? ›

Drilling holes in substrates of the Diesel Particulate Filter to make exhaust gases flow more freely through the structure defeats the purpose of the component which is to remove soot from the exhaust.

Do you have to tune your truck after deleting it? ›

The short answer is yes and no. If the truck is running fine then you don't need a tune but if it won't start or if it is throwing a bunch of codes yes, you need a tune.

What happens when you delete a diesel truck? ›

After a diesel delete is completed, the soot-clogging issues are eliminated. There may also be performance improvements such as an increase in torque/horsepower as well as an improvement in fuel economy. These positive changes can depend on the tuner, the after-market software, and the engine hardware.

Are EGR delete kits illegal? ›

If you are asking, “Is EGR delete legal?” Deleting a vehicle's exhaust gas recirculation (EGR) system is illegal in all the 50 states in the U.S. The United States has created laws that serve as a standard that all vehicles must meet to be eligible for road use.

Will diesel trucks be outlawed? ›

Is California banning diesel trucks? Back in 2020, California proposed a diesel engine ban. This is because diesel-powered buses and heavy-duty trucks cause more pollution than most other vehicle classes. But you can still buy a diesel truck in California and the state has set no date to ban them.

Can you reverse a DPF Delete? ›

DPF deletes (off-road kits) are completely reversible.

Is driving a deleted truck illegal? ›

Deleting a truck is illegal nationwide in the USA, and the EPA has been known to fine deleted truck owners. Consumers can expect to be fined a minimum of $2,500 and a maximum of $7,500 for driving with a deleted truck on public roads.

How much power can a stock 6.7 Cummins handle? ›

The Model Year (MY) 2018 Cummins 6.7L Turbo Diesel engine is a featured option for 2018 RAM 2500 and 3500 pickups and RAM 3500, 4500, and 5500 chassis cabs. This dynamic inline 6-cylinder gives RAM class-leading power and towing capacity, producing up to 385 horsepower and 930 pound-feet torque.

What is the best delete tuner for 6.7 Cummins? ›

1) MADS Smarty 6.7 Cummins Tuner

Our favorite tuner on the market is the Smarty touch tuner from MADS. It is compatible with all 6.7 Cummins years up through 2018. For years 2013+ you will need an unlock module to crack into the ECU.

How can I make my 6.7 Cummins get better gas mileage? ›

RAM Cummins 6.7 L - Getting the best MPG - YouTube

Can you tell if a DPF has been removed? ›

If a filter has been removed, the car will fail its MOT. Removing the DPF will sometimes cause the warning light to glow – and this itself is an MOT failure point: no dashboard warning lights should remain on during the test.

Should I delete my EGR and DPF? ›

Do DPF and EGR delete increase power? Because DPFs and EGRs obstruct your exhaust and dilute the air/fuel ratio in your engine, removing them may help to increase your engine power.

Can a deleted truck pass emissions? ›

It's very likely that a diesel with DPF deleted will now fail emissions test, no matter what country or state you are in. That is why it is strongly discouraged that you do no DPF delete your diesel vehicle.

Is deleting a diesel illegal in Texas? ›

You may remove an emission system or device at any time if you are replacing it with one that is specified for that vehicle and is equally effective in reducing emissions.

Does a DPF Delete void warranty? ›

Unfortunately, a DPF delete, or diesel particulate filter delete, will normally void the Ford warranty. In most cases, any type of delete—be it a muffler, exhaust, etc. —will also void the warranty because it alters the original underpinnings of the vehicle.

Can a blocked DPF damage the engine? ›

Blocked DPFs wreak havoc with the delicate balance of your engine by preventing the normal venting of gases, which causes a variety of engine issues, as described above. In addition to reduced power and fuel efficiency, a blocked filter may eventually cause a dangerous mechanical malfunction and break your engine.

Can I remove DPF myself? ›

We highly do not recommend anyone to remove their DPF filter and not replace it. If you are unsure how to replace a DPF filter than bring your vehicle to DPF solutions, having expert specialists replace your DPF at a high standard without the need to spend time doing it yourself.

How long does it take to remove DPF? ›

How long does the regeneration take? The DPF regeneration cycle takes approximately an hour and a half (1 1/2 hours) to complete and can be completed as part of a routine service.

What kind of fuel mileage does the 6.7 Cummins get? ›

The 2022 RAM 2500 comes equipped with a 6.7-liter Cummins® Turbo Diesel Inline-6 and 6.4-liter HEMI® V8 engine that produces up to 410 hp and 429 lb. -ft. of torque in 4×4 configuration. The engine is rated to do up to 12 city/18 highway/15 combined MPG on the fuel economy when running in the four-wheel drive mode.

How do I get the most MPG out of my diesel? ›

Behavioral Ways to Increase Diesel Engine Fuel Mileage
  1. Avoid Idling. ...
  2. Use Synthetic Oil. ...
  3. Accelerate Evenly. ...
  4. Use the Cruise. ...
  5. Lower Your Highway Speed. ...
  6. Know Your Engine. ...
  7. Optimize Your Weight. ...
  8. Check Your Tires.

How can I maximize my diesel fuel economy? ›

12 Tips to Improve Diesel Fuel Mileage
  1. Turn your engine off. ...
  2. Use shore power when you can. ...
  3. Avoid revving the engine. ...
  4. Find your engine's sweet spot and run with it. ...
  5. Use your air conditioner as sparingly as possible. ...
  6. Anticipate upcoming traffic lights. ...
  7. Maintain an extended following distance.

Does DPF stop black smoke? ›

Black smoke is usually indicative of fuel or soot in the exhaust fumes which can be resolved with a little mechanical detective work. If you are noticing black smoke coming out of your diesel car then the chances are this is due to soot build up or the diesel particulate filter (DPF) cleaning itself.

What causes GREY smoke from exhaust? ›

Blue or Grey Smoke

If the smoke from the exhaust pipe is either grey or bluish-tinged, it generally means that your engine is burning oil inside the combustion chamber. Burning oil could be due to a number of causes, from leaky valve seals to bad piston rings.

Can DPF cause blue smoke? ›

Blue smoke is another common DPF smoke color. This means that the engine is burning oil and it is released through the exhaust. This is caused due to worn out valves or piston rings in the engine.

What happens when you drill holes in exhaust? ›

Drilling holes in your exhaust will definitely make it sound louder. This is because some of the sound waves will be able to escape to the atmosphere before they could be silenced by the muffler. This will cause your car not just sound louder but it will also sound more aggressive.

How do you reset a DPF pressure sensor? ›

DPF additive level reset steps:
  1. Jack up the vehicle. Disconnect the battery. ...
  2. Remove the dosing pump hose(s) (3). Remove the additive reservoir from the housing (1). ...
  3. Fit in the reverse order. Reset the level display to zero. ...
  4. Select the vehicle as shown in the illustration. ...
  5. Further information. ...
  6. Tools and equipment.

How do you clean a DPF filter? ›

DIY Chemical Clean Your DPF at Home (Diesel Particulate Filter)

What is the best delete tuner for 6.7 Cummins? ›

1) MADS Smarty 6.7 Cummins Tuner

Our favorite tuner on the market is the Smarty touch tuner from MADS. It is compatible with all 6.7 Cummins years up through 2018. For years 2013+ you will need an unlock module to crack into the ECU.

What does a EGR delete do on a 6.7 Cummins? ›

An EGR delete consists of using a delete kit to remove the system. The benefits include an improvement in engine performance, fuel economy and not having to worry about emergency maintenance on the EGR (or even the engine itself).

What tuner will delete DPF and EGR? ›

The Mini Maxx Tuner is the next gen diesel tuning solution from H&S. The Mini Maxx Tuner offers preloaded tunes that will delete all emission components of your diesel truck. When you install the Mini Maxx, you will be able to run your vehicle after a DPF delete.

What is the best delete kit for 6.7 Powerstroke? ›

Best Delete Kit: Diesel Dudes 6.7 Powerstroke Complete Delete Kit. Delete tunes will also render the EGR system useless, so we usually recommend going with a complete delete kit and removing the DPF and the EGR.

How much HP does a tuned 6.7 Cummins have? ›

The new high-output engine boasts 420 hp and 1,075 lb-ft of best-in-class torque.

Who writes the best tunes for 6.7 Cummins? ›

Quick Take - Best Tuners For 6.7 Cummins

Smarty Touch. MM3 Tuner w/ GDP Custom Tunes. Edge Insight CTS3.

How much power can a stock 6.7 Cummins handle? ›

The Model Year (MY) 2018 Cummins 6.7L Turbo Diesel engine is a featured option for 2018 RAM 2500 and 3500 pickups and RAM 3500, 4500, and 5500 chassis cabs. This dynamic inline 6-cylinder gives RAM class-leading power and towing capacity, producing up to 385 horsepower and 930 pound-feet torque.

Will EGR delete hurt engine? ›

What some people don't realize is that yes, deleting an EGR system can help prevent some expensive repairs. But they can also cause major problems in other parts of your engine.

Does an EGR delete make black smoke? ›

An EGR system delete will not cause black smoke because it doesn't involve incomplete combustion. A vehicle will release black smoke due to excess fuel running into the engine, thereby leading to incomplete combustion.

Will EGR delete improve fuel economy? ›

You can improve your fuel efficiency with an EGR delete.

You may see up to a 20% increase in your fuel economy when using this product option while promoting improved longevity of the engine at the same time.

Do you need a tune after EGR delete 6.7 Cummins? ›

We have customers frequently asking about custom tunes for their deleted Cummins 6.7 trucks. However, most of them do not need a custom tune for their current setup, our standardised tunes on the RaceMe Ultra supports even moderate race applications.

Does Bully Dog delete EGR? ›

Description. This Bully Dog DPF Delete Tuner features a 2.5inch Color screen. It allows removal of DPF/Cat, EGR and Urea injection. It has Built in gauges and safety features and allows you to precisely tune your engine with HP gains.

Where is DPF tunes located? ›

Our main shipping warehouse is located in BC, Canada. How long will it take you to ship my order? DPFtunes.com prides itself on quick and secure shipping. Most orders in stock will be shipped within 1-5 business days.

Does a DPF delete get rid of DEF? ›

Some diesel owners are opting to “delete” these pollution-control components instead. A diesel delete involves taking out the DEF system, removing the catalytic converter and DPF, and installing a new exhaust. The vehicle's ECU (engine control unit) will also have to be reprogrammed using a tuner.

What is the life expectancy of a 6.7 Powerstroke? ›

High-Mile Reliability (6.7L)

After years of production, the 6.7L Power Stroke has proven it can storm past the 200,000-mile mark with few repairs. Provided you adhere to Ford's recommended service intervals, there is no reason this engine won't see 300,000 or even 400,000 miles.

Is deleting a diesel good? ›

To put it bluntly, no, you should not remove the emissions equipment from any diesel pickup. Regardless of local and state testing requirements, it is a federal crime to remove any factory installed emissions equipment. Removing emissions equipment also voids the vehicle's factory warranty.


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