The Ultimate 6.7 Cummins DPF Delete Guide


At Diesel Tech, we understand that the 6.7 Cummins DPF Delete process can be quite overwhelming for diesel truck owners. This comprehensive guide will provide you with all the information you need to make an informed decision and confidently perform a successful DPF delete on your 6.7 Cummins engine.

Understanding the 6.7 Cummins Diesel Particulate Filter (DPF)

The Diesel Particulate Filter (DPF) is a crucial component of your 6.7 Cummins engine’s exhaust system. Its primary function is to capture and store soot particles produced during the combustion process, thereby reducing harmful emissions. Over time, the DPF can become clogged, which may lead to reduced engine performance, increased fuel consumption, and possible damage to the engine and exhaust system components.

Benefits of a 6.7 Cummins DPF Delete

Performing a DPF delete on your 6.7 Cummins engine offers several advantages:

  1. Improved Fuel Efficiency: With the DPF removed, your engine will consume less fuel, saving you money at the pump.
  2. Enhanced Engine Performance: A DPF delete allows your engine to breathe more easily, resulting in increased horsepower, torque, and throttle response.
  3. Reduced Maintenance Costs: The absence of a DPF means fewer expensive cleanings or replacements.
  4. Extended Engine Life: Eliminating the DPF reduces the risk of damage caused by excessive backpressure and heat buildup.

Before proceeding with a DPF delete, it’s important to note that removing or tampering with emissions control devices is illegal in many jurisdictions. Be sure to check and comply with all local, state, and federal laws regarding emissions modifications. Diesel Tech does not condone or support any activities that violate emissions regulations.

Components Required for a 6.7 Cummins DPF Delete

To perform a successful DPF delete on your 6.7 Cummins engine, you will need the following components:

  1. DPF Delete Kit: This includes all the necessary hardware, such as exhaust pipes and clamps, to replace the DPF.
  2. DPF Delete Tuner: A specialized tuner is required to reprogram your engine’s computer to operate without the DPF in place.

Step-by-Step 6.7 Cummins DPF Delete Process

Follow these steps to complete the DPF delete on your 6.7 Cummins engine:

  1. Disconnect the Battery: Before starting any work, disconnect the negative battery cable to ensure your safety and prevent any accidental electrical issues.
  2. Remove the DPF: Locate the DPF in your exhaust system and carefully remove it. Be sure to also disconnect any sensors or wiring connected
  3. to the DPF. 3. Install the DPF Delete Kit: Following the manufacturer’s instructions, install the DPF delete kit components, ensuring a proper fit and secure connections.
  4. Reprogram the Engine Control Module (ECM): Using the DPF delete tuner, reprogram the ECM to ensure optimal performance without the DPF. This step is critical, as it prevents potential damage and ensures your engine operates efficiently.
  5. Reconnect the Battery and Start the Engine: Once the installation is complete, reconnect the negative battery cable and start the engine. Monitor for any warning lights or unusual sounds, indicating a potential issue.
  6. Inspect for Leaks and Test Drive: With the engine running, inspect the exhaust system for any leaks, making any necessary adjustments. Take your truck for a test drive to ensure proper performance and functionality.

Maintaining Your 6.7 Cummins After a DPF Delete

Following a successful DPF delete, proper maintenance is crucial to ensure the longevity and performance of your 6.7 Cummins engine. Here are some tips for maintaining your engine after a DPF delete:

Regular Oil Changes: Adhering to the recommended oil change intervals is vital to keeping your engine clean and functioning optimally.

Monitor Exhaust Gas Temperatures (EGT): Keep an eye on your EGT levels to prevent excessive heat, which can cause engine damage.

Perform Regular Inspections: Regularly inspect your engine, exhaust system, and all related components for any signs of wear, damage, or leaks.

Use High-Quality Fuel: Always use high-quality diesel fuel to prevent contaminants from harming your engine or causing performance issues.


Performing a 6.7 Cummins DPF delete can offer significant benefits in terms of fuel efficiency, engine performance, and reduced maintenance costs. However, it’s essential to consider the legal implications and adhere to all emissions regulations. By following this comprehensive guide and maintaining your engine properly, you can ensure optimal performance and longevity for your 6.7 Cummins engine.

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