Understanding the 6.7 Cummins DPF Delete: An Overview

The 6. 7 cummins dpf delete can result in various problems, including engine damage and illegal emissions.

This type of modification occurs when the diesel particulate filter or exhaust gas recirculation system is removed or disabled. The 6. 7 cummins diesel engine is a popular choice for pickup trucks due to its reliability and power. However, some owners opt to delete their dpf to improve performance or fuel efficiency. While it may seem like a simple modification, the consequences of this action can be severe. Engine damage, decreased fuel economy, and illegal emissions are just a few of the problems that can arise from a dpf delete. In this article, we will explore the potential risks and drawbacks of removing the diesel particulate filter from a 6. 7 cummins engine.

Understanding the 6.7 Cummins DPF Delete: An Overview

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What Is A Dpf Delete, And How Does It Work?

Explanation Of What A Dpf Delete Is

A dpf delete is a process that involves the removal of the diesel particulate filter (dpf) from a vehicle’s exhaust system. This modification is done to eliminate dpf-related problems, which can be inconvenient and expensive for some truck owners. A dpf delete is popular among truck enthusiasts, as it is thought to improve performance and fuel economy.

Brief Overview Of The Emissions System In A 6.7 Cummins Engine

A 6. 7 cummins engine is equipped with an emissions system that includes a diesel oxidation catalyst (doc), a dpf, and a selective catalytic reduction (scr) system. The doc is located in the exhaust system and helps to reduce hydrocarbon and carbon monoxide emissions.

The dpf then captures and reduces remaining particulate matter. Finally, the scr system uses a urea solution to convert nitrogen oxide emissions into harmless gases.

Description Of How A Dpf Delete Works And Why Someone Would Choose To Do It

A dpf delete works by physically removing the dpf from the exhaust system and replacing it with a straight pipe. This modification allows for greater airflow and reduces exhaust backpressure, leading to improved engine performance and fuel economy. A dpf delete is typically chosen by truck owners who use their vehicles frequently for tasks like towing or hauling heavy loads, which can cause the dpf to clog or malfunction.

Removing the dpf eliminates the need for costly repairs and maintenance associated with faulty dpfs. However, it is important to note that a dpf delete is illegal in many states and may void a vehicle’s warranty.

6.7 Cummins Dpf Delete Benefits

Improved Engine Performance

The 6. 7 cummins engine with dpf (diesel particulate filter) can experience a significant decrease in engine performance due to the accumulation of soot and ash in the filter.

  • Improved horsepower and torque for more power and acceleration.
  • Faster spooling of turbochargers for better throttle response.
  • Fewer instances of regenerations, where the filter is cleaned by burning off the accumulated soot.

Enhanced Fuel Efficiency

Dpf removal can also result in better fuel economy, saving on the number of refuels required and reducing the overall cost of running the engine.

  • More power leads to less time required for acceleration, resulting in less fuel consumption.
  • Fewer regenerations also help reduce fuel consumption, as they require additional fuel to burn off soot from the filter.

Fewer Maintenance Costs

The dpf filter requires regular cleaning and maintenance as part of its operation.

  • Cost savings on filter cleaning/replacement and maintenance services.
  • Fewer breakdowns due to less complicated and less expensive engine parts required.

Better Longevity For The Engine

The dpf filter’s regular regeneration process can reduce the engine’s lifespan as it causes the engine oil to become contaminated quickly.

  • Increased longevity of the engine due to fewer instances of regenerations.
  • Reduced engine stress due to improved performance, which leads to a more extended working lifespan.

Using a 6. 7 cummins dpf delete can provide numerous benefits that enhance the engine’s performance, fuel efficiency, and longevity while lowering overall maintenance costs.

Ram 6.7 Cummins DEF & DPF Delete

6.7 Cummins Dpf Delete Problems

Legal Concerns And Potential Penalties

If you’re considering deleting the diesel particulate filter (dpf) in your 6. 7 cummins engine, it’s essential to understand the legal consequences of doing so. While removing the dpf may increase horsepower and fuel efficiency, it’s against epa regulations and can lead to hefty fines if caught.

  • Tampering with emissions controls is illegal under the clean air act and can result in significant fines or even jail time.
  • The fines for violating the clean air act can be substantial, ranging from $2,500 to $37,500 per vehicle per day.
  • If you’re caught driving a vehicle without a functioning dpf and are subjected to an emissions test, you could face additional fines and penalties.

Environmental Impact Of Removing The Diesel Particulate Filter

Beyond the legal ramifications of dpf deletion, there are significant environmental concerns to consider as well. Removing the dpf can increase emissions of harmful pollutants like nitrogen oxides, particulate matter, and carbon monoxide.

  • Dpfs play a crucial role in reducing harmful diesel emissions and protecting air quality.
  • Diesel emissions contribute to smog, acid rain, and respiratory health problems, particularly for vulnerable populations like children and the elderly.
  • Removing the dpf increases emissions and can have a significant impact on the environment and public health.

The Risk Of Damaging The Engine With Improper Installation

While dpf deletion can increase horsepower and fuel economy, it also poses a risk to the engine if not done correctly. Improper installation can cause a range of problems, from decreased performance to permanent engine damage.

  • Removing the dpf can affect the engine’s backpressure and temperature, potentially causing damage to other engine components.
  • Installing a dpf delete kit requires significant mechanical expertise, and it’s essential to follow all instructions carefully.
  • Even minor mistakes during installation can cause permanent damage to the engine, resulting in costly repairs.

Increased Chance Of Failing Emissions Tests

Finally, it’s worth noting that removing the dpf can increase the likelihood of failing emissions tests, which can lead to lost time and money. States have different emissions testing requirements, but many require that vehicles have all original emissions controls installed.

  • In most states, tampering with emissions systems will result in an automatic failure of the emissions test.
  • Running without a dpf will likely result in significantly higher emissions that exceed legal limits.
  • Failing an emissions test can lead to additional costs and hassle to bring the vehicle into compliance.

Pros Of A 6.7 Cummins Dpf Delete

If you own a 6. 7 cummins engine, there are various reasons why you may be considering a dpf delete. While some people may consider it to be a bit risky, others believe it to be a lifesaver for their engines.

In this article, we will discuss all the pros of a 6. 7 cummins dpf delete, including improved performance and fuel efficiency, fewer maintenance costs, increased longevity for the engine, and improved towing capability.

Improved Performance And Fuel Efficiency

Here are some key points concerning the improved performance and fuel efficiency of a 6.

  • After removing the dpf, the engine system can breathe freely, allowing more airflow and increasing horsepower.
  • As the engine breathes better, the fuel economy increases since better combustion leads to better fuel mileage.
  • You will also notice a significant improvement in the throttle response, which will make the truck feel more responsive and quicker on its feet.

Fewer Maintenance Costs

Here are some key points concerning the reduced maintenance costs after a 6.

  • When the dpf is removed, it translates into fewer maintenance costs since you will not need to worry about replacing filters or cleaning the dpf.
  • By removing the dpf, you will no longer experience periodic regeneration, meaning you’ll have one less maintenance hassle to deal with.
  • A reduction in maintenance costs allows the truck owner to focus on other aspects of their truck and perhaps save some extra bucks.

Increased Longevity For The Engine

Here are some key points concerning the increased longevity for the engine after a 6.

  • By removing the dpf and allowing the engine to breathe better, the engine’s lifespan is extended since the engine is operating at a cooler temperature.
  • The dpf can become clogged and cause backpressure, leading to increased wear and tear on the engine parts. By removing the dpf, the engine’s lifespan is extended, since the engine will not be subject to high levels of backpressure.

Improved Towing Capability

Here are some key points concerning the improved towing capability after a 6.

  • With the dpf removed, towing capability is increased since the engine is now able to breathe more freely, making it easier to pull heavy loads.
  • As the engine breathes better, the exhaust temp is lowered, which reduces the chances of overheating when towing heavy loads.
  • Removing the dpf also reduces the weight of the vehicle, making it more efficient when towing heavy loads.

A 6. 7 cummins dpf delete can significantly improve the performance and fuel efficiency of your engine, reduce maintenance costs, extend the engine’s lifespan, and improve your vehicle’s towing capability. Always consult a professional mechanic before carrying out any major engine modification, and ensure that any modifications made to your truck comply with state and federal regulations.

Cons Of A 6.7 Cummins Dpf Delete

Legal Issues And Potential Penalties

Modifying your vehicle’s emissions system and deleting the dpf is considered illegal in most states. The epa imposes hefty fines and penalties for people caught tampering with their emission systems. Our advice is to consult with legal counsel and mechanic experts before committing to any emissions modifications to avoid any legal trouble and costly fines.

Environmental Impact

Removing the dpf from your cummins engine will affect the environment. The filter plays a crucial role in capturing and reducing harmful emissions from your vehicle. Deleting the dpf means your truck will start emitting more nitrogen oxides (nox). They’re toxic in large amounts and contribute to air pollution.

Therefore, deleting the dpf will affect not only your truck but the environment as well.

Possibility Of Engine Damage With Improper Installation

When installing an aftermarket dpf delete kit, the process must be done correctly. An improper installation can lead to engine damage. This damage may include increased wear and tear on the engine components or higher fuel consumption. An expert should handle the installation process to avoid unexpected repair costs and engine issues.

Trouble With Emissions Tests

One potential issue with a 6. 7 cummins dpf delete is that your vehicle may struggle to pass an emissions test. Most states require emissions testing to ensure the vehicle’s exhaust emissions comply with the environmental protection agency (epa) regulations.

Without a dpf, your vehicle may produce higher levels of emissions, making testing a challenge. If you live in a state that tests for emissions, you risk failing the test and facing costly repairs.

By understanding the potential cons of a 6. 7 cummins dpf delete, you’ll have the knowledge you need to make an informed decision. Be sure to speak with experts to fully grasp the potential legal, environmental, and financial implications of deleting the dpf.

What To Consider When Choosing A 6.7 Cummins Dpf Delete Kit

Are you planning to upgrade your 6. 7 cummins engine by removing the dpf? Before you take the plunge, make sure you carefully consider these factors to ensure a successful upgrade.


The cost of a 6. 7 cummins dpf delete kit can vary considerably based on the components’ quality and the included services.

  • Don’t always trust the cheapest kit available, as the quality can be inferior, and it may not be compliant with state or federal regulations.
  • Check multiple suppliers and compare prices to ensure you get the best value for your money.
  • Always ask for a detailed list of services included in the price to avoid hidden fees.

Quality Of The Kit

The quality of the 6. 7 cummins dpf delete kit is crucial for smooth engine performance and its overall lifespan.

  • Look for a kit made of high-quality materials to ensure it can withstand daily use without risking damage to the engine.
  • Check online reviews and user experiences before purchasing to ensure its overall quality.
  • Ensure the kit you’re buying is compatible with your specific cummins engine model and truck.

Certification And Compliance With State And Federal Regulations

Make sure you choose a 6. 7 cummins dpf delete kit that is certified and complies with state and federal regulations to prevent any legal issues.

  • Look for kits offering emissions testing to ensure compliance with regulations.
  • Ensure the kit is certified by various regulatory bodies or has an epa certification.
  • Consider purchasing from a reputable supplier with a good track record of compliance.

Compatibility With Your Specific Truck Model

Not all 6. 7 cummins dpf delete kits are compatible with every truck model, so double-check this before making a final decision.

  • Research and ensure the kit you’re considering works with your truck model’s engine.
  • Check compatibility with the year model of your truck to ensure the kit can accommodate your truck’s engine control module.
  • Verify whether the kit will require any custom installation to ensure a good fit.

Warranty And Customer Support

Your 6. 7 cummins dpf delete kit needs to have a solid warranty and robust customer support in case you encounter any issues.

  • Choose kits with warranties lasting at least a year to ensure peace of mind.
  • Look for suppliers offering customer support both before and after installation.
  • Check online reviews from previous customers to gauge the supplier’s customer service quality.

Before investing in a 6. 7 cummins dpf delete kit, ensure you do your due diligence when it comes to pricing, quality, certification, compatibility, warranty, and customer support. By making an informed choice, you will be well on your way to better engine performance and reliability.

Top 6.7 Cummins Dpf Delete Kits Of 2021

If you’re looking for increased power, better fuel efficiency, and a less problematic engine, then a dpf delete kit could be the solution you need. Here are the top 6.

Kit 1: Sinister Diesel Egr Delete Kit

The sinister diesel egr delete kit is a top-of-the-line kit that will give your cummins engine increased power and efficiency.

  • Made from high-grade materials that are built to last
  • Designed to perfectly fit your 6.
  • Comes with a full warranty from the manufacturer

This kit is the perfect solution if you want to eliminate your cummins engine’s egr system.

Kit 2: Flopro Cummins Delete Pipes

Flopro cummins delete pipes are designed to increase airflow and help your engine perform at its best.

  • Made from high-quality, t-304 stainless steel
  • Designed to fit your 6.
  • Comes with a limited lifetime warranty from the manufacturer

If you want to improve the performance of your engine while eliminating the dpf, the flopro cummins delete pipes are an excellent choice.

Kit 3: S&B Filters Throttle Valve Kit

The s&b filters throttle valve kit is one of the most affordable dpf delete kits on the market, but that doesn’t mean it isn’t effective.

  • Made from high-quality billet aluminum
  • Designed to fit your 6.
  • Comes with a full one-year warranty from the manufacturer

If you’re working on a budget, the s&b filters throttle valve kit is a great choice for a dpf delete.

By choosing one of these top dpf delete kits for your 6. 7 cummins engine, you’ll enjoy increased performance and power. Just be sure to check local regulations before proceeding, and keep in mind that modifying your engine can potentially void your warranty.

Step-By-Step Guide For Installing A 6.7 Cummins Dpf Delete

Pre-Installation Preparation

Before you begin installing a 6. 7 cummins dpf delete kit, several pre-installation preparations should be made to ensure that the installation process proceeds smoothly.

  • Make sure that you have all the tools that you need, including a socket set, wrenches, pliers, and cutters.
  • Familiarize yourself with the installation instructions and ensure that you understand every step.
  • Verify that you have the necessary part kit in excellent condition, including the dpf delete pipe, muffler, and sensors.
  • Turn off the engine and allow it to cool down before beginning the installation.

Removal Of The Dpf And Related Components

The first step in the process of installing a 6. 7 cummins dpf delete is to remove the dpf and its associated parts.

  • Disable all electrical connections to the dpf by removing all sensors attached to it.
  • Detach the exhaust pipe and muffler from the dpf.
  • Remove the dpf from the vehicle.
  • Disconnect and remove the heat shield from the dpf.
  • Clean the exterior of the dpf pipe and sensor ports to remove any debris.

Installation Of The New Kit

With the dpf and related parts removed, you can move forward with installing the new kit.

  • Install the new muffler and make sure it is secured firmly in position.
  • Install the dpf delete pipe and connect it to the muffler.
  • Install all sensors onto the delete pipe.
  • Reattach the exhaust pipe to the delete pipe.
  • Verify the proper installation of all parts and secure them in place.

Post-Installation Checks And Testing

The final step in the installation of a 6. 7 cummins dpf delete involves post-installation checks and testing.

  • Turn on the engine and let it run for a few minutes to verify that there are no leaks.
  • Take the vehicle for a test drive to verify that the dpf delete is functioning correctly.
  • Ensure that a reputable mechanic inspects the installation to certify its proper removal and installation.

By following this step-by-step guide, you can easily install a 6. 7 cummins dpf delete kit with no problems. Once completed, you can enjoy the benefits of improved performance, efficiency, and increased horsepower in your vehicle.

Potential Issues With 6.7 Cummins Dpf Delete Installation

Are you considering a 6. 7 cummins dpf (diesel particulate filter) delete? Removing your dpf can improve your engine’s performance and fuel economy, but it may also come with potential installation challenges.

Risk Of Damaging The Engine

Removing your dpf can put your engine at risk.

  • Overheating – the dpf plays a crucial role in lowering the temperature within your engine. Without it, the engine can overheat and potentially lead to a catastrophic failure.
  • Lack of protection – the dpf shields your engine against harmful contaminants. Without it, these contaminants can ruin your engine’s components, such as the turbocharger and piston rings.
  • Breach of warranty – if your vehicle is new, a dpf delete can void your warranty.

Troubleshooting Common Installation Errors

If you are installing the dpf delete yourself, watch out for these common installation errors:

  • Using incompatible parts – certain systems are only compatible with specific models. Ensure that the system you purchase is compatible with your vehicle.
  • Poor quality parts – watch out for cheap or poorly made parts. The quality of the parts you use can affect the engine’s performance.
  • Improper installation – incorrect installation can lead to engine damage, and fixing it can be quite costly. Always follow the manufacturer’s instructions carefully.

Ensuring Proper Certification And Compliance With Local Regulations

Ensure that your dpf delete is certified and complies with local regulations.

  • Environmental concerns – dpfs reduce pollution, and some jurisdictions require diesel engines to have them installed. Removing it can harm the environment.
  • Legal issues – removing the dpf can be illegal in some areas. A certified dpf delete system complies with all necessary regulations.
  • Inspection failure – without a dpf, your vehicle may not pass emissions inspections.

A 6. 7 cummins dpf delete can provide significant benefits, but it comes with potential installation challenges. By being aware of the possible issues and taking necessary precautions, you can ensure that your vehicle runs smoothly while still being lawful and environmentally responsible.

Frequently Asked Questions For 6.7 Cummins Dpf Delete Problems


After analyzing the 6. 7 cummins dpf delete problems, it is clear that these modifications can offer benefits to diesel truck owners. However, it is important to weigh the pros and cons before making any modifications. Negative consequences such as legal issues and environmental impacts can arise from improper dpf delete installation and usage.

Additionally, owners must remember that modifying their vehicle can void warranty and result in expensive repairs. Ultimately, it is crucial to prioritize the longevity and health of the vehicle as well as adhere to local laws and regulations. Proper research, installation, and maintenance are necessary for a successful dpf delete modification.

By following these guidelines, diesel truck owners can reap the benefits of improved performance and efficiency while maintaining responsibility and safety.

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