Contents
Contents
If your 6.7L Cummins is plagued by DPF regen failures, EGR cooler leaks, or DEF system warnings, a delete kit may be the solution. This guide covers what a delete kit is, the top products in 2026, how to choose the right one, and the pros and cons -so you can make an informed decision on what is the best delete kit for your 6.7 Cummins.
Please note: Deleting the emissions control system is illegal for on-road vehicles in all 50 states of the United States. The information in this article is provided for educational purposes and closed-course/off-road use only. Be sure to understand your local laws before modifying your vehicle.
What Is a 6.7 Cummins Delete Kit?
The 6.7L Cummins delete kit is a set of aftermarket components designed to remove or bypass the factory emissions control system, specifically for Dodge Ram 2500/3500 and Cab & Chassis vehicles from 2007 to this year.
This system typically includes hardware components and matching tuning software, aiming to remove or bypass the three major emissions systems — EGR (Exhaust Gas Recirculation), DPF (Diesel Particulate Filter), and DEF/SCR (Diesel Exhaust Fluid/Selective Catalytic Reduction).
EGR (Exhaust Gas Recirculation)
The factory EGR system is responsible for routing a portion of exhaust gases back into the intake manifold to reduce NOx emissions. However, after prolonged use, carbon buildup tends to form in the intake system, severely clogging the intake passages, intake valves, and the EGR cooler. The cooler is also prone to cracking, allowing coolant to enter the cylinders.
Deleting it removes the EGR cooler and valve, seals the ports with a block‑off plate, and disables related signals via tuning. Result: fresh air only, no carbon buildup, better throttle response, and cleaner oil.
DPF (Diesel Particulate Filter)
The main job of the DPF is to trap particulate matter produced by diesel combustion to meet emissions standards. The problem is that under long-term short-distance driving, low-speed operation, or frequent towing, regeneration often doesn't complete properly, leading to clogging. Some owners experience DPF clogging warnings as early as 60,000 miles, putting the truck into limp mode, with dealership replacement quotes as high as $3,000–$4,000. Even if you force a regeneration, fuel consumption runs 2–3 MPG higher than normal.
When deleting, the factory DPF along with the exhaust section is removed and replaced with a straight-through delete pipe, while the differential pressure sensor is also removed or disabled. After DPF deletion, exhaust backpressure drops significantly, the turbo spools faster, and no fuel is wasted on regenerations. Many owners report daily fuel economy improving from around 14 MPG to 17 MPG.
DEF/SCR (Diesel Exhaust Fluid/Selective Catalytic Reduction System)
The factory DEF/SCR system works by injecting DEF (urea solution) into the exhaust to reduce nitrogen oxides into harmless nitrogen and water. The problem lies in its long system chain, which includes the DEF pump, injector, heater, level sensor, and NOx sensors — multiple components that can fail. Once any part malfunctions, it can trigger fault codes, torque limiting, or even speed limiting.
When deleting DEF, the DEF tank, DEF pump, injection nozzle, and SCR catalytic converter are removed, the SCR section is replaced with a straight pipe, and all related sensors (level, temperature, NOx sensors) are disconnected. After deletion, you are completely free from DEF refilling and maintenance hassles.
Software Tuning - An Essential Piece
After the hardware is removed, the ECU will illuminate the check engine light and enter limp mode due to missing sensor signals. Therefore, you must reflash the ECU with a diesel tuner to disable EGR, DPF, and DEF-related logic, turn off regeneration cycles, and recalibrate injection timing and boost parameters. Without software tuning, the hardware delete is pointless — some owners have removed only the DPF without tuning, only to find the truck throwing codes and going into limp mode every dozen or so miles, making it undrivable. The two are inseparable.
Top 4 Best 6.7 Cummins Delete Kits 2026
1. Best EGR Delete Kit for 6.7 Cummins
Kit Contents: EGR block-off plate, coolant bypass lines, gaskets, and mounting hardware.
Benefits:
- Completely eliminates EGR carbon buildup, keeping the intake system clean.
- Temperature in the EGR-deleted area drops by 20°C (approx. 68°F), under-hood temperature drops by 7°C (approx. 12.6°F).
- Long-term use can save hundreds to thousands of dollars, with fuel efficiency improved by about 5% .
- No more periodic cleaning or replacement of EGR components.
- 6061 billet aluminum CNC machining, stainless steel, and 3-layer silicone hoses, heat-resistant to 1,472°F , fully corrosion-proof.
Suitable for: Owners who want to improve engine reliability without deleting DPF/DEF; those living in areas with strict emissions testing (keeping DPF and DEF housings while only deleting EGR makes it harder to detect).
2. Best DPF Delete Kit for 6.7 Cummins
Kit Contents: 5-inch post-turbo DPF delete pipe (no muffler), clamps, mounting brackets.
Benefits:
- Eliminates DPF regeneration cycles - no more worrying about interrupted or failed regens.
- 5-inch post-turbo straight-through design greatly increases exhaust flow and reduces exhaust resistance.
- Completely eliminates DPF clogging and regeneration problems, drastically lowering long-term maintenance costs.
- T-409 stainless steel construction, more heat-resistant and corrosion-resistant than factory.
- The DPF hardware alone can contribute 30–70 HP gains, with even more significant gains when paired with tuning.
Suitable for: Owners primarily troubled by DPF regeneration issues; those who frequently drive short trips (which prevent DPF regeneration from completing); drivers seeking a more direct throttle response.
3. Best EGR+DPF Combo Delete Kit for 6.7 Cummins
Kit Contents: EGR block-off plate + coolant bypass lines + 5-inch post-turbo DPF delete pipe + throttle valve delete kit.
Benefits:
- Solves both EGR carbon buildup and DPF regeneration pain points.
- Significant performance gains: 60–100 HP and 120–200 lb-ft of torque.
- Fuel economy improvement of 1–3 MPG .
- 5-inch post-turbo exhaust pipe with no muffler, effectively reducing exhaust backpressure under load.
- T-409 stainless steel and precision-machined aluminum for long-lasting durability.
Suitable for: Owners seeking a comprehensive performance and reliability upgrade; heavy towing users; those who want to solve all emissions system problems at once.
4. Best All-in-One Full Delete Kit for 6.7 Cummins
Kit Contents: EGR delete kit + DPF delete pipe (4-inch straight pipe, no muffler) + CCV crankcase ventilation modification filter kit + Mini Maxx V2 delete tuner.
Benefits:
- 100–200+ HP gain, 200–400+ lb-ft torque gain.
- Fuel economy improvement of 3–5 MPG .
- Completely eliminates all emissions-system-related fault codes and limp mode.
- Significantly lowers exhaust gas temperature (EGT), reducing engine heat load.
- One kit includes EGR delete, DPF delete, CCV modification, and the Mini Maxx V2 tuner - hardware and software in one package.
Suitable for: Users pursuing maximum performance and a complete modification experience; vehicles already out of warranty; trucks used off-road or on closed courses.
If you drive a different model year of the 6.7L Cummins, or want to explore more hardware combinations and tuner options, feel free to visit SuncentAuto's dedicated 6.7 Cummins category page to find the full product line that fits your vehicle.
Why Choose SuncentAuto?
SuncentAuto has over 10 years of experience in the diesel truck modification industry, focusing on providing high-performance, high-value auto parts. The quality services we offer:
- Free shipping within the U.S.
- 45-day return and exchange policy
- Comprehensive product coverage: from EGR deletes to complete All-in-One kits, meeting diverse needs
- OEM-grade material standards: 409 stainless steel pipes, CNC-machined block-off plates for durability and precise fitment
- Professional technical support: expert team providing installation guidance and troubleshooting
👉 Shop SuncentAuto 6.7 Cummins delete kits now and use exclusive reader promo code BLOG12 to enjoy 12% off!
How to Choose the Best 6.7 Cummins Delete Kit - Factors to Consider
Model Year Compatibility
Whether you drive a 2012, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, or 2022 model, finding the best delete kit for your specific 6.7 Cummins year is crucial. Below we break down compatibility by model year.
- 2007–2009: No DEF system – Choose an EGR+DPF delete kit (skip DEF components).
- 2010–2012: First models equipped with DEF – Full EGR/DPF/DEF delete kit.
- 2013–2018: Updated ECU – Need a tuner with specific programming for 2013 and later models.
- 2019 to now: Stringent emissions sensors – Choose a kit with "sensor bypass adapters" to avoid entering limp mode.
Tuning Requirement
The tuner must be used together with the delete kit — neither works without the other.
| Scenario | Result |
| Delete kit only (without tuner) | ECU detects missing parts → triggers check engine light → truck goes into limp mode. |
| Tuner only (without delete kit) | Slight performance improvement, but emissions components are prone to clogging, leading to expensive repairs. |
| Delete kit + tuner | Runs clean and efficient, maximum power, and no warning lights. |
Material Quality
The material of the exhaust delete pipe directly affects durability and corrosion resistance. Prioritize T-409 stainless steel. T-409 stainless steel offers excellent corrosion resistance and high-temperature performance, ensuring the delete pipe remains durable and rust-free under harsh conditions for long-term use. Low-quality galvanized steel or plain carbon steel pipes will corrode quickly in high-temperature and humid environments and should be avoided.
Brand Reputation and User Feedback
In the diesel truck community, brand reputation often reflects real-world reliability. Before buying, take time to read real user reviews on forums to understand actual experiences with different brands. You can evaluate products from the following aspects: reliable performance, clear installation instructions, solid after-sales support, and a good return policy.
Is Deleting a 6.7 Cummins Worth It? - Full Pros and Cons Analysis
Pros of Deleting a 6.7 Cummins
1. Significant Performance Increase
This is the most obvious advantage of a delete kit. A stock 6.7 Cummins outputs approximately 350 HP and 660 lb-ft of torque. After deletion and professional tuning, typical output reaches 400–450 HP and 800+ lb-ft of torque.
2. Fuel Economy Improvement
After DPF deletion, the engine no longer burns extra fuel for regenerations — studies show that DPF regeneration increases fuel consumption by about 13%. After deletion, many owners report fuel economy gains of 1–3 MPG, and with more aggressive tuning, even 3–5 MPG.
3. Drastically Reduced Maintenance Costs
EGR cooler replacement costs about $1,200–$2,500, and DPF replacement costs about $3,000–$5,000. After deletion, these expensive repairs are eliminated.
4. Extended Engine Life
EGR deletion prevents carbon particles from depositing in the intake passages and combustion chamber, and the risk of EGR cooler leakage disappears. Many owners report significantly improved oil analysis results after deletion, allowing them to safely extend oil change intervals.
Cons of Deleting a 6.7 Cummins
1. Legal Risk (Most Important)
Under Section 203 of the Clean Air Act, removing or tampering with emissions control devices on on-road vehicles is a federal violation. After the DOJ policy adjustment in January 2026, criminal prosecutions have decreased, but civil penalties still exist.
⚠️ Special note: The delete kits described in this article are for educational purposes and off-road use only. State and federal laws strictly restrict emissions system modifications. Please fully understand your local regulations before purchasing and installing.
2. Resale Value Impact
Although some modification enthusiasts specifically look for modified used trucks, most buyers deliberately avoid vehicles that have been deleted because the new owner would inherit the legal liability for emissions non-compliance.
3. Inspection and Registration Issues
In states that conduct emissions testing (e.g., California, Colorado, New York), a deleted vehicle will fail the annual inspection and cannot be legally registered.
How to Install the 6.7 Cummins Delete Kit
Installation Steps:
Step 1. Ensure the vehicle has no diagnostic fault codes (clear all current/historical fault codes before proceeding).
Step 2. Flash the delete tune using the tuner (engine off, ignition on).
Step 3. After confirming the tune is loaded, disconnect the battery.
(Important Note: The emissions system must be disabled after installing the tuner to ensure proper operation.)
Step 4. Remove DPF/DEF/EGR hardware.
Step 6. Reconnect battery, start engine, verify no warning lights.
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. You can explore available kits on the SuncentAuto website if you'd like to compare specifications.
