6.7 Cummins EGR Delete Kit: Maximizing Performance and Efficiency

Lynn Martelli
Lynn Martelli


In the realm of diesel engines, the 6.7 Cummins stands tall as a powerhouse, renowned for its robust performance and reliability. However, like any modern engine, it grapples with emissions regulations, particularly the Exhaust Gas Recirculation (EGR) system. While serving environmental purposes, this system can hinder the engine’s performance and longevity. Enter the 6.7 Cummins EGR Delete Kit – a solution embraced by many diesel enthusiasts and professionals alike to unleash the engine’s full potential while maintaining compliance. This comprehensive guide delves into the intricacies of EGR delete kits, their benefits, installation process, legality, and impact on performance.

Understanding the 6.7 Cummins EGR System

Before delving into the delete kit, it’s crucial to grasp the role of the EGR system in the 6.7 Cummins engine. The EGR system recirculates a portion of exhaust gases back into the engine’s intake system, reducing nitrogen oxide (NOx) emissions by lowering combustion temperatures. While effective in curbing emissions, this process has many drawbacks, including carbon buildup, reduced engine efficiency, and increased likelihood of component failure over time.

The Need for EGR Delete Kits

Diesel enthusiasts seeking to optimize their 6.7 Cummins engines often turn to EGR delete kits to mitigate the drawbacks associated with the stock EGR system. These kits typically include block-off plates, replacement coolant lines, and tuning software. These kits aim to improve engine efficiency, reduce carbon buildup, and enhance overall performance by eliminating or rerouting the EGR flow.

Benefits of EGR Delete Kits

1. Improved Engine Performance: Removing the restrictive EGR system optimizes airflow within the engine, leading to improved combustion efficiency and increased power output.

  2. Enhanced Fuel Economy: Better combustion efficiency brings improved fuel economy, a welcomed benefit for both daily drivers and commercial vehicles.

3. Reduced Maintenance Costs: Eliminating the EGR system reduces the likelihood of carbon buildup, which can lead to costly repairs and maintenance down the line.

4. Extended Engine Longevity: EGR delete kits can contribute to the longevity of the 6.7 Cummins engine by reducing the strain on engine components and minimizing carbon deposits.

Installation Process

Installing a 6.7 Cummins EGR delete kit requires moderate mechanical proficiency and the right tools. While specific instructions may vary depending on the kit manufacturer, the general steps typically involve the following:

1. Preparation: Ensure the engine is excellent and disconnect the battery to prevent electrical mishaps.

2. Removal of EGR Components: Remove the existing EGR valve, cooler, and associated plumbing from the engine.

3. Installation of Delete Kit Components: Install the block-off plates, replacement coolant lines, and any other components included in the kit.

4. Tuning: Use tuning software to recalibrate the engine’s computer to account for the EGR system’s absence and optimize performance.

5. Testing: Start the engine and carefully monitor for leaks or abnormalities. Once confirmed, take the vehicle for a test drive to ensure proper functionality.

Legality and Compliance

It’s essential to address the legality of EGR delete kits, as tampering with emissions control systems may violate environmental regulations and void warranties. While some jurisdictions allow off-road vehicles or competition use exemptions, using EGR delete kits on road-going cars may result in fines or penalties. Before proceeding with an EGR delete, it’s crucial to research local laws and regulations to ensure compliance.

The Debate Surrounding EGR Delete Kits

The use of EGR delete kits has sparked debate within the automotive community. Proponents argue that these kits offer tangible benefits in terms of performance and efficiency, while opponents raise concerns about increased emissions and environmental impact. Strike a balance between maximizing performance and minimizing ecological harm remains a topic of contention.


The 6.7 Cummins EGR delete kit represents a popular option for diesel enthusiasts seeking to unlock the full potential of their engines. By eliminating the restrictive EGR system, these kits offer a range of benefits, including improved performance, enhanced fuel economy, and reduced maintenance costs. However, it’s essential to consider the legal and environmental implications before proceeding with an EGR delete. The decision to install an EGR delete kit should be made after carefully considering the vehicle’s intended use and local regulations.

Share This Article