How To Remove Your 6.7 Cummins DPF and EGR

How To Remove Your 6.7 Cummins DPF and EGR

Author: SPELAB Mechanical Engineer (focusing on car modification for 10 years)

If you have a 6.7 Cummins diesel, chances are your truck has a Diesel Particulate Filter (DPF) and Exhaust Gas Recirculation (EGR). These two devices are designed to reduce emissions from the exhaust system.

Still, they can cause problems for owners who want to modify their trucks with performance modifications such as turbochargers or nitrous.

For your 6.7 Cummins diesel to run at peak efficiency requires proper maintenance and care. This mainly includes regular tune-ups every 8,000 miles, ensuring that the DEF tank is filled correctly and replaced with new filters regularly.

Many of the 6.7 Cummins owners have the Exhaust Gas Recirculation (EGR) and Diesel Particulate Filter (DPF) on their trucks removed for various reasons. This guide will show you how also to perform a DPF delete 6.7 Cummins and the EGR delete 6.7 Cummins.

Tools You Need for the Job

If you own a 6.7 Cummins, you probably know that the DPF and EGR systems are emission control devices. It's also one of the most hated features on your truck because it limits performance and causes premature wear.

The good news is that doing the DPF delete 6.7 Cummins and EGR delete 6.7 Cummins can be done relatively easily by yourself. You'll need some tools, but nothing too exotic or expensive.

• 10mm socket and ratchet
• 5mm socket and ratchet (valid for a DPF delete pipe)
• 14mm socket and ratchet (useful for an EGR delete kit)
• Torque wrench
• Socket set
• Pliers
• Screwdrivers
• Drain pan
• Disposable gloves and eye protection

Step 1: Remove the Driver's Side Inner Fender Liner

The first step is to remove the driver's side inner fender liner (previously incorrectly referred to as the "mudflap"). This removal allows you to access the engine bay more easily to remove the DPF. You will need a 10mm socket or wrench and possibly a ratchet extension if your socket is not long enough.

To remove the inner fender liner, remove the two bolts that hold it to the truck. These bolts are 10mm, so a wrench or socket with a 10mm opening will be needed.

Step 2: Disconnect the EGR Tube

The EGR tube connects the EGR valve to the intake manifold and is located on top of the intake manifold, just above the turbocharger. To disconnect the EGR tube from the manifold, you must remove a bolt and an O-ring from each end using a 13mm wrench.

If you have an EGR delete kit installed, remove this tube from the bottom of your intake manifold. The tube should come out easily, but if it is stuck, use a rubber mallet or hammer to gently tap it out of place.

Additional Tip: Use a Timer for Safe Disconnections

When disconnecting components like the EGR tube or DPF sensors, it's beneficial to use a timer to track how long each step takes and ensure the engine is cool before proceeding. This helps prevent any accidental damage or burns and ensures that the procedure is performed safely and correctly.

Step 3: Remove the Downpipe

To remove the DPF, you need to remove the single downpipe (corrected from "downpipes") connected to the exhaust manifold. This can be done with an impact wrench and socket set.

Step 4: Remove the Turbo Connections (If Applicable)

Note: The 6.7 Cummins in Ram Trucks has a single turbo setup, not a "turbo y-bridge." This was a mistake in the original guide. You will need to disconnect the single turbo from the exhaust manifold, not a y-bridge.

Further Steps

Continue following the steps to remove the remaining components, such as the coolant hoses and electrical connectors, following safe practices to ensure no damage to the engine or yourself.

Conclusion

The Cummins 6.7 diesel has an embedded diesel particulate filter (DPF) that needs to be removed if you plan on cleaning the rest of the system. The EGR will also need to come out or be modified. There is a lot of misinformation floating around the internet concerning this procedure, but this article has shown you the correct way to do it. With the DPF delete pipe and EGR delete kit, Undertaking the DPF delete 6.7 Cummins and EGR delete 6.7 Cummins system is not hard and can be done with essential tools and a bit of time.

Read more:

6.7 cummins egr delete instructions

what is the best delete kit for 6.7 cummins

FAQs

Q1: What happens if you delete EGR and DPF?
A1: Deleting the EGR and DPF can improve performance and fuel economy but may increase emissions and be illegal.

Q2: How much HP does a DPF and EGR delete add?
A2: A DPF and EGR delete can add 50-100 horsepower, depending on the tune and other modifications.

Q3: Can you delete EGR without deleting DPF?
A3: It is possible to delete the EGR without deleting the DPF, but it may not provide optimal performance improvements.

Q4: What happens when you delete a 6.7 Cummins?
A4: Deleting a 6.7 Cummins can improve power and fuel efficiency but may void warranties and increase emissions.

Q5: Is removing DPF a good idea?
A5: Removing the DPF can boost performance but is illegal in many areas and can result in higher emissions.

Q6: Can you reverse DPF delete?
A6: Yes, a DPF delete can be reversed by reinstalling the original parts and resetting the engine control unit (ECU).

Q7: What are the benefits of deleting EGR and DPF?
A7: Benefits include increased horsepower, better fuel economy, and reduced exhaust backpressure.

Q8: What are the risks of deleting EGR and DPF?
A8: Risks include potential engine damage, voided warranties, legal penalties, and increased environmental impact.

Q9: How much does it cost to delete EGR and DPF on a 6.7 Cummins?
A9: The cost can range from $1,000 to $4,000, including parts, labor, and tuning.

Q10: Is it legal to delete EGR and DPF on a 6.7 Cummins?
A10: Deleting EGR and DPF is illegal under federal emissions laws and can result in fines and penalties.