The Best Delete Kit for 6.7 Cummins: Enhancing Performance and Efficiency

The 6.7 Cummin engine is renowned for its power and durability, making it a popular choice among truck owners. However, some individuals may seek to optimize their engine’s performance and fuel efficiency by removing certain emissions control components. This is where delete kits come into play. In this article, we will explore the best delete kit options available for the 6.7 Cummins engine, discussing their features, benefits, and considerations.

1. DPF Delete Kits:

One of the most common delete kits for the 6.7 Cummins is the Diesel Particulate Filter (DPF) delete kit. The DPF is responsible for trapping and burning particulate matter in the exhaust system, reducing emissions. However, it can also restrict airflow and cause increased backpressure, limiting engine performance. DPF delete kits typically include a straight pipe or high-flow replacement for the DPF, allowing for improved exhaust flow and increased power output.

When choosing a DPF delete kit, it is essential to consider the legality of removing emissions control components in your region. Some areas have strict regulations regarding emissions modifications, and non-compliance can result in fines or penalties. Additionally, it is crucial to select a delete kit that is compatible with your specific model year of the 6.7 Cummins engine.

2. EGR Delete Kits:

The Exhaust Gas Recirculation (EGR) system in the 6.7 Cummins engine recirculates a portion of exhaust gases back into the intake manifold to reduce nitrogen oxide emissions. However, the EGR system can also introduce carbon buildup and decrease engine efficiency over time. EGR delete kits offer a solution by replacing or blocking off the EGR valve and cooler, preventing exhaust gas recirculation.

When considering an EGR delete kit, it is important to note that removing the EGR system may not be legal in all areas. Additionally, deleting the EGR system can result in increased nitrogen oxide emissions, which may impact the environment. Therefore, it is crucial to research and understand the regulations and environmental implications before proceeding with an EGR delete.

3. DEF Delete Kits:

Selective Catalytic Reduction (SCR) systems in modern diesel engines, including the 6.7 Cummins, use Diesel Exhaust Fluid (DEF) to reduce nitrogen oxide emissions. While DEF is effective in reducing pollutants, it requires regular refilling and can be an additional expense for truck owners. DEF delete kits eliminate the need for DEF by disabling the SCR system, resulting in cost savings.

Before considering a DEF delete kit, it is important to understand that removing the SCR system is illegal in many regions due to emissions regulations. Furthermore, disabling the SCR system can lead to increased nitrogen oxide emissions, contributing to air pollution. It is crucial to weigh the potential benefits against legal and environmental considerations before opting for a DEF delete kit.

4. Tuner and Delete Kit Combos:

For those seeking maximum performance gains, tuner and delete kit combos are worth considering. Tuners are electronic devices that modify the engine’s parameters, such as fuel injection timing and turbo boost pressure, to optimize performance. When paired with delete kits, tuners can further enhance power output and fuel efficiency by recalibrating the engine’s settings to accommodate the removed emissions control components.

When choosing a tuner and delete kit combo, it is essential to select a reputable brand that offers reliable performance tuning options specifically designed for the 6.7 Cummins engine. Additionally, consider the level of customization and adjustability offered by the tuner to ensure it meets your specific needs and preferences.


Delete kits for the 6.7 Cummins engine provide truck owners with an opportunity to enhance performance and efficiency by removing emissions control components. However, it is crucial to consider the legal and environmental implications before proceeding with any modifications. DPF delete kits offer improved exhaust flow, while EGR delete kits prevent carbon buildup. DEF delete kits eliminate the need for Diesel Exhaust Fluid, but may not comply with emissions regulations. Tuner and delete kit combos provide maximum performance gains when paired with reputable tuning options. Ultimately, thorough research and understanding of local regulations are essential when selecting the best delete kit for your 6.7 Cummins engine.

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