If you own a 6.7-liter Cummins diesel engine, you've probably heard of "delete kits." These kits promise increased power, improved fuel economy, and extended engine life by removing emission-limiting components. But with so many options on the market, which one is the best choice? What is the best delete kit for 6.7 Cummins?
This guide will provide a detailed breakdown of everything you need to know—from what a delete kit is, factors to consider when choosing one, installation tips, to the best kit for your 6.7L Cummins engine in 2025.
What Is a 6.7L Cummins Delete Kit?
A 6.7L Cummins delete kit is an emission control system removal kit for 6.7L Cummins engines. The kit is a series of hardware components, usually including tuning software, designed to remove or bypass the original emission systems—namely, the EGR, DPF, and DEF systems.
- EGR Removal: Prevents exhaust gas recirculation, reducing carbon buildup and overheating.
- DPF Removal: Removes the diesel particulate filter, preventing forced regeneration and exhaust back pressure.
- DEF/SCR Removal : Disables urea injection, simplifying maintenance and preventing DEF system malfunctions.
In addition, a tuning software (tuner) is typically required to prevent the engine malfunction indicator lamp from illuminating or entering limp mode.
Benefits of Installing a Delete Kit for 6.7 Cummins
After the emission control system kit was removed, the Cummins engine was able to breathe freely. How effective was it?
- Enhanced Traction and Off-Road Performance : Studies show that increased back pressure leads to increased fuel consumption and reduced thermal efficiency. Therefore, removing limiting components can improve horsepower and off-road traction.
- Fuel Cost Savings : Research indicates that fuel consumption increases during DPF regeneration ( up to approximately 13%). Removing the DPF allows the engine to run more efficiently, saving you fuel costs each month.
- Reduced Maintenance Costs : Carbon deposits in the DPF increase engine load and require frequent cleaning. Removing the DPF eliminates the need for cleaning and maintenance, significantly reducing long-term maintenance costs.
- Extended Engine Life : Removing the EGR system keeps intake air clean and reduces carbon deposits, resulting in smoother engine operation and a longer lifespan.
- Better Throttle Response: Removing the exhaust system reduces exhaust drag, eliminating throttle lag and providing faster, more stable acceleration.
Can You Delete Without Tuning (or Tune Without Deleting)?
In short—no, both are necessary. The tuner must be used in conjunction with the removal kit. Removing the emission control system without tuning will cause the vehicle to enter limp mode, while tuning without removing the emission control system will cause emissions malfunction.
| Scenario | Result |
|---|---|
| Delete kit only (no tuner) | The ECU detects missing parts → triggers check engine light → truck enters limp mode. |
| Tuner only (no delete kit) | Slight performance boost, but emissions parts clog quickly and cause costly repairs. |
| Delete kit + tuner | Clean, efficient operation with maximum power and no warning lights. |
SuncentAuto vs Other Brands: Which Delete Kit Is Worth Buying?
Among all the brands that offer 6.7 Cummins delete kits, SuncentAuto stands out for its comprehensive coverage, high quality, and excellent service.
| Dimension | SuncentAuto | Other Brands |
|---|---|---|
| Coverage Type | All-in-One Delete Kit (EGR / DPF / DEF / CCV) | All-in-One Kit (EGR / DPF / DEF, some with CCV) |
| Compatible Model Years | 2007–2024 6.7L Cummins | Limited to specific years (e.g., 2010–2012 or 2019–2021) |
| Material | T409 stainless steel | Aluminized steel |
| Includes Tuner? | ✅ | Often sold separately or requires extra setup |
| After-sales / Tech Support | ✅ Own logistics ✅ 45-day free returns ✅ Installation guide ✅ Email technical support | 14–30 day return, limited support |
| Price Range | $999–$1,299 | $1,000 - $1,500+ |
💡 Why Choose SuncentAuto?
Durable stainless steel construction, full coverage for 2007-2024 models, easy installation guide, free shipping within the US, and a 45-day no-questions-asked return policy.
Ready to upgrade your Cummins engine? Get a 10% discount coupon and start shopping now! Code: 10%NEWINAUTO
What to Consider When Choosing a 6.7 Cummins Delete Kit?
Choosing the right 6.7 Cummins upgrade kit depends on your truck's model year, intended use, and budget. Here are the most important factors to consider:
1. Vehicle Compatibility by Year
The ECU and exhaust system configuration differs for each generation of the 6.7-L Cummins engine. Before purchasing a kit, be sure to confirm your vehicle's model year and ensure it matches your vehicle.
2. Is Tuning Required?
Yes. After removing the exhaust system, the ECU continues to monitor sensors related to DPF, EGR, and DEF. Therefore, after removing the hardware, the ECU must be recalibrated to:
Prevent fault codes
Disable regenerative cycling and DEF indicators
View also: Is Tuning Required after DPF Delete
3. Materials and Durability
The two most common materials are stainless steel and aluminized steel. Choose a stainless steel exhaust kit for better durability and corrosion resistance.
4. Choose a Reputable and Reliable Vendor
Be sure to choose a reputable and tried-and-tested brand. You can evaluate products based on these aspects: reliable performance, clear installation instructions, comprehensive after-sales support, and a good return policy.
Types of Delete Kits for 6.7 Cummins (EGR / DPF / DEF / Full Delete)
Save More on Performance Upgrades: Use code 10%NEWINAUTO at checkout on SuncentAuto.com to get 10% OFF select delete kits and custom tuning bundles.
When upgrading your 6.7L Cummins engine, you can choose the removal kit that suits you.
1. Full Delete Kit with Custom Tuning
Includes : EGR removal pipe, DPF, DEF removal pipe, and tuner.
Ideal for: Completely removes all emission-limiting components and reprograms your ECU. Suitable for drivers seeking ultimate performance.
2. DPF + SCR (DEF) Removal Kit
Includes : DPF removal pipe, SCR/DEF bypass system, and optional muffler or straight-through pipe.
Ideal for: Users who want to reduce DPF-related issues while retaining EGR.
3. EGR Removal Kit Only
Includes : EGR removal components.
Ideal for : Users who prioritize reducing carbon buildup and lowering exhaust temperatures while still meeting emission standards.
How to Install the 6.7 Cummins Delete Kit
⚠️ Note: For off-road use only. Please check local laws before installation.
Installation Steps:
Step 1. Ensure the vehicle has no diagnostic fault codes (clear all current/historical fault codes before proceeding).
Step 2. Start the vehicle and install the tuner module.
Step 3. Remove the DPF/DEF/SCR aftertreatment hardware.
(Important Note: The emissions system must be disabled after installing the tuner to ensure proper operation.)
Step 4. Disable the EGR system components.
Step 5. Start the engine and idle for 5-10 minutes. Monitor all systems for any abnormalities. Road test conducted after verification.
Installation Precautions:
1. Prohibit high-temperature operations to prevent burns
After the vehicle is turned off, high-temperature components such as the exhaust system need to cool down sufficiently (approximately 30 minutes) before disassembly or assembly.
2. Perform rust removal beforehand
Common high-temperature components and chassis component screws are prone to rust. Necessary rust removal treatment is required before disassembly to prevent screws from jamming.
3. Wear protective equipment
For example, when performing exhaust pipe modifications that require cutting, wear safety goggles and take appropriate isolation measures to prevent accidents caused by flying sparks.
4. Environmental protection
After DIY maintenance or modification upgrades, used engine oil, coolant, etc., must be disposed of at designated recycling stations.
For detailed illustrated instructions, please visit SuncentAuto's Installation page.
Conclusion
What is the best delete kit for 6.7 Cummins? The best delete kit for a 6.7 Cummins engine should balance durability, compatibility, and cost-effectiveness. Compared to other aftermarket kit brands, SuncentAuto offers a more reliable all-in-one solution. It's made of durable stainless steel, suitable for year-round use, and offers industry-leading aftermarket support. Ready to upgrade your 6.7 Cummins? Shop now at SuncentAuto! (Note: Always adhere to applicable laws and regulations and best installation practices before proceeding.)
