Maximizing Performance and Efficiency: A Comprehensive Guide to L5P Duramax Tuning and Delete Kits Flashark

The L5P Duramax engine stands as a pinnacle of diesel engineering, offering robust performance and efficiency. However, for enthusiasts seeking even greater power and enhanced efficiency, tuning and delete kits present an appealing option. This article delves into the world of L5P Duramax tuning and delete kits, exploring the benefits, installation process, and real-world experiences. If you are also interested in Duramax l5p like me and want to have a deeper understanding, then read on! I'm sure you'll be inspired after reading this guide.

Understanding the L5P Duramax Engine

The 2019 Duramax L5P engine is the fifth-generation iteration of General Motors' Duramax diesel engine series. Known for its technological advancements and improved performance, the L5P engine was introduced to deliver exceptional power, efficiency, and durability.

Advanced Features and Specifications

  1. Duramax L5P Engine Design:The L5P engine features a 90-degree V8 configuration with a cast-iron engine block for strength and durability. It utilizes a lightweight aluminum cylinder head to reduce overall engine weight and improve fuel efficiency.
  2. Turbocharger Technology:Equipped with a variable-geometry turbocharger, the L5P engine optimizes boost pressure at various engine speeds, enhancing power delivery and responsiveness across the RPM range.
  3. High-Pressure Common Rail Injection System:The L5P Duramax employs a high-pressure common rail fuel injection system, delivering precise fuel metering and multiple injections per combustion cycle. This results in improved fuel efficiency, reduced noise, and lower emissions.
  4. Advanced Exhaust After-Treatment:To comply with strict emissions standards, the L5P engine features an exhaust after-treatment system, including a Diesel Particulate Filter (DPF), Selective Catalytic Reduction (SCR) system, and an Exhaust Gas Recirculation (EGR) system.
  1. B20 Biodiesel Capability:The L5P engine is designed to handle up to a 20% blend of biodiesel (B20), providing an environmentally friendly fuel option without compromising performance.

Benefits and Limitations of the L5P Duramax Engine:

  1. Impressive Power and Torque:The L5P Duramax engine delivers robust power and torque, making it suitable for heavy-duty applications such as towing, hauling, and off-roading.
  2. Enhanced Fuel Efficiency: Despite its power capabilities, the L5P engine is engineered to be more fuel-efficient than previous Duramax generations, leading to reduced fuel consumption and operating costs.
  3. Durability and Longevity:The L5P engine's robust construction, along with advanced materials and engineering techniques, enhances its durability and longevity, making it a reliable option for demanding tasks.
  4. Advanced Emissions Technology:The L5P engine's emissions after-treatment system helps to reduce harmful pollutants, making it environmentally friendly and compliant with stringent emissions regulations.
  5. Complex Emissions Systems: While the emissions after-treatment systems contribute to reduced emissions, they also add complexity to the engine. Components like the DPF, EGR system, and SCR require maintenance and can be prone to issues over time.

The Role of Tuners in L5P Duramax Performance

Explanation of Duramax Tuners and Their Purpose

Duramax tuners are aftermarket devices that interact with the engine's control module to adjust parameters like fuel injection timing, turbo boost pressure, and transmission shifting. These modifications can result in increased horsepower and torque, improved throttle response, and enhanced drivability.

Benefits of Tuning the L5P Duramax Engine

  1. Increased Power:Tuning can unleash additional power and torque, making the L5P more capable for heavy hauling or towing.
  2. Enhanced Fuel Efficiency:Fine-tuning the engine's performance can lead to improved fuel economy, especially when driving under specific conditions.
  3. Optimized Performance for Different Applications:Tuners often offer different tuning profiles, enabling drivers to tailor their L5P engine's behavior to suit their needs, whether it's towing, daily driving, or off-roading.

Popular L5P Duramax Tuner Brands and Models

When it comes to tuning the L5P Duramax engine for optimal performance and efficiency, several reputable brands offer a range of tuners to choose from. Each tuner provides unique features, user interfaces, and tuning capabilities. Here are some popular L5P Duramax tuner brands and their flagship models:

1. EFI Live:

EFI Live is a well-known name in the diesel tuning industry, and their AutoCal and FlashScan V2 devices are highly regarded for their versatility and performance. These tuners allow users to load custom tunes onto the L5P engine's ECM, providing complete control over various parameters. With the ability to switch between multiple tuning profiles on the fly, EFI Live tuners are favored by enthusiasts seeking flexibility and customization options.

2. PPEI :

PPEI, or Kory Willis, is a respected name in the diesel tuning community, and his tunes for the L5P Duramax have gained significant popularity. PPEI offers handheld tuners with preloaded custom tunes that are optimized for different applications, including towing, daily driving, and high-performance use. Their tuning options focus on delivering enhanced power while maintaining reliability and drivability.

3. Flashark (Recommended):

Flashark is a rising star in the diesel tuning world, gaining popularity for its innovative approach to tuning the L5P Duramax engine. As far as the introduction is concerned, there is a product that you must not miss is Flashark 2017-2021 6.6L Chevy GMC Duramax Diesel L5P EGR Delete Kit. Installing an EGR Delete is one of the best upgrades to improve the reliability of your 6.6 Duramax pickup. With this EGR Delete, you will be able to completely remove the EGR valve and EGR cooler.

Eliminating the EGR system will prevent soot from building up and clogging the EGR valve. Fresh, dense, clean air can now be circulated instead of reintroducing hot exhaust gases into the intake. Improved exhaust flow allows the turbocharger to start faster, resulting in quicker throttle response.

This EGR delete unit has been carefully designed and engineered to recirculate engine coolant faster and more efficiently than the stock EGR system. High-quality components include billet aluminum construction, nickel-plated steel flanges, stainless steel dipstick tube bracket, high-temperature silicone hoses, zinc-plated hardware, and precision-fit o-rings.

Flashark's unique technology provides impressive power gains, improved fuel efficiency, and optimized driving characteristics, making it a standout option for L5P Duramax owners.

Considerations Before Choosing a Tuner

  1. Warranty Implications:Modifying the engine with a tuner may void parts of the manufacturer's warranty, necessitating careful consideration before proceeding.
  2. Emissions Compliance:Some tuners offer options that maintain emissions systems integrity, ensuring compliance with local regulations.

L5P Delete Kit Explained

An L5P delete kit is a comprehensive package designed to remove emissions components like the Diesel Particulate Filter (DPF), Exhaust Gas Recirculation (EGR) system, and Selective Catalytic Reduction (SCR) system. By eliminating these components, exhaust flow improves, leading to potential performance gains.

Components Included in the Kit

  1. DPF Delete Pipes:The DPF delete pipes are designed to replace the factory-installed DPF. They provide a free-flowing exhaust path, eliminating exhaust gas restrictions imposed by the DPF.
  2. EGR Delete Kit:The EGR delete kit consists of hardware, such as block-off plates and coolant reroute hoses, to eliminate the EGR system's functionality. By doing so, hot exhaust gases are no longer recirculated into the intake manifold, resulting in cooler intake air and reduced carbon buildup.
  3. SCR Delete Kit (Optional): Some delete kits may include components to disable or bypass the SCR system. The SCR delete kit is typically used in off-road applications, as it results in higher emissions and may not comply with environmental regulations.

The Importance of Emissions System Delete for Performance

  1. Reduced Backpressure:By removing the DPF and other emissions components, exhaust backpressure is reduced, enabling the engine to breathe more efficiently.
  2. Lower Operating Temperatures:Without the DPF and EGR, the engine runs cooler, potentially increasing longevity and reducing the risk of component failure.

Considerations of Using a Delete Kit

  1. Legal Implications:Explain the potential legal consequences of using delete kits, as removing emissions components often violates environmental regulations.
  2. Environmental Impact:Discuss the environmental implications of running a deleted engine, particularly in areas with stringent emissions standards.

Installing an L5P Delete Kit on Your 2019 Duramax: Step-by-Step Guide


  1. Gather Necessary Tools and Equipment: Ensure you have the required tools, including sockets, wrenches, pliers, screwdrivers, and safety equipment like safety goggles and gloves.
  2. Read the Instructions: Thoroughly review the instructions provided with the delete kit to familiarize yourself with the process and any specific requirements.
  3. Disconnect the Battery: Before starting any work, disconnect the negative terminal of the vehicle's battery to prevent any electrical accidents.

Step 1: Remove EGR System Components

  1. Locate the EGR Cooler: The EGR cooler is typically located near the top of the engine, connected to the exhaust and intake systems.
  2. Disconnect Hoses and Electrical Connectors: Carefully disconnect any hoses and electrical connectors attached to the EGR cooler.
  3. Remove EGR Cooler: Using the appropriate tools, unbolt and remove the EGR cooler from the engine.
  4. Install Block-off Plates: The delete kit should include block-off plates that are designed to seal the openings left after removing the EGR cooler. Secure the block-off plates in place using the provided hardware.
  5. Reroute Coolant Hoses (If Required): Some delete kits may include reroute hoses to maintain proper coolant flow. Follow the provided instructions to ensure the engine's cooling system functions correctly after the EGR removal.

Step 2: Install DPF Delete Pipes

  1. Locate the DPF: The Diesel Particulate Filter is usually positioned under the vehicle, near the exhaust system.
  2. Remove DPF: Carefully unbolt and remove the DPF from the exhaust system.
  3. Install DPF Delete Pipes: The delete kit should come with replacement pipes designed to eliminate the DPF's restrictions. Attach the DPF delete pipes to the existing exhaust system, ensuring a secure fit with proper clamps and gaskets.

Step 3: Optional SCR Delete (Off-Road Use Only)

  1. Check Local Regulations: Determine if using an SCR delete kit is permissible in your region. Note that SCR deletes are typically intended for off-road or competition use only.
  1. Remove SCR Components: If allowed, follow the instructions provided with the SCR delete kit to remove or bypass the SCR system components.

Step 4: Tuning (Optional)

  1. Install Custom Tuner (If Provided): Some delete kits may include a custom tuning device to reprogram the engine control module (ECM) for optimal performance without the removed emissions systems. Follow the provided instructions to install the tuner and load the appropriate custom tune onto the ECM.

Step 5: Post-Installation Checks

  1. Double-Check Connections: Review all connections, hoses, and block-off plates to ensure everything is properly secured.
  2. Reconnect Battery: Reconnect the negative terminal of the battery.

Step 6: Compliance and Inspection (Important)

  1. Verify Local Compliance: Before operating the vehicle, verify that the delete modifications comply with local laws and regulations. Failure to comply could result in legal consequences.
  2. Inspection and Maintenance: It is essential to perform regular maintenance on the vehicle, paying particular attention to exhaust and emissions-related systems.

Maintaining Your L5P Duramax After Tuning and Deleting

After installing an L5P delete kit and tuning your Duramax engine, proper and regular maintenance becomes even more critical to ensure optimal performance and longevity. The modifications can lead to improved power and efficiency, but it's essential to stay proactive in caring for your vehicle.

  1. Regular Oil Changes

   - Stick to the manufacturer-recommended oil change intervals, and use high-quality diesel engine oil that meets the specified standards.

   - Opt for synthetic oil for better engine protection and improved performance.

  1. Air Filter Maintenance

   - Regularly inspect and clean the air filter, or replace it if it's damaged or excessively dirty.

   - A clean air filter ensures proper airflow, preventing contaminants from entering the engine.

  1. Fuel Filter Replacement

   - Follow the recommended fuel filter replacement schedule to avoid fuel system issues.

   - Ensure you use quality fuel filters that meet the manufacturer's specifications.

  1. Cooling System Care

   - Check the coolant level regularly and maintain the proper mixture of coolant and water as per the manufacturer's guidelines.

   - Inspect hoses and connections for any signs of leaks or damage.

  1. Exhaust System Inspection

   - Routinely inspect the exhaust system, including the DPF delete pipes and any other modifications, for leaks, loose connections, or damage.

   - Address any issues promptly to avoid potential problems with exhaust gas recirculation or emissions control.

  1. Monitor Engine Parameters

   - If your custom tuning device allows for monitoring engine parameters, keep an eye on essential data such as coolant temperature, oil pressure, and exhaust gas temperature.

   - Abnormal readings may indicate potential issues that require attention.

  1. Stay Updated with ECM Tunes

   - If you have a custom tuner, regularly update the ECM tunes to keep up with any advancements or improvements made by the tuning company.

   - Updated tunes may optimize performance and address any potential issues that arise over time.

  1. Perform Regular Diagnostics

   - Invest in a reliable diagnostic tool to monitor the vehicle's health and detect any potential error codes or malfunctions.

   - Promptly address any issues indicated by the diagnostic tool.

  1. Responsible Driving Habits

   - Practice responsible driving habits, avoiding aggressive driving or heavy towing without proper modifications.

   - Give the engine time to warm up before pushing it to higher RPMs, especially during cold starts.

  1. Professional Inspections

   - Schedule periodic inspections with a qualified mechanic or diesel specialist to check for any underlying issues or wear and tear.

   - A professional inspection can help identify and address potential problems before they escalate.


By following these maintenance practices, you can ensure that your tuned and deleted L5P Duramax engine continues to perform optimally and remains reliable for years to come. Responsible maintenance and care are essential to get the most out of your modifications while preserving the engine's longevity and efficiency.

Customer Reviews and Experiences

  1. Many L5P Duramax owners report a noticeable increase in power and torque after tuning and deleting the emissions systems. They describe a significant improvement in acceleration, towing capacity, and overall performance, making daily driving and hauling tasks more effortless.
  1. Numerous customers mention improvements in fuel efficiency after tuning and deleting their L5P engines. They report better MPG figures during highway cruising and, in some cases, even in stop-and-go traffic. This improved fuel economy is especially appreciated by drivers with extensive mileage requirements.
  1. Tuning the L5P engine often results in enhanced throttle response, making the vehicle more responsive and enjoyable to drive. Truck owners appreciate the immediate power delivery, which adds to the overall driving experience.
  1. Several L5P Duramax owners highlight a decrease in EGR-related problems, such as clogged EGR valves or coolers. Removing the EGR system can lead to cleaner intake air, reducing carbon buildup and the need for costly EGR-related repairs.
  1. Some owners notice smoother and more precise transmission shifts after tuning their L5P engines. This improvement contributes to a more refined driving experience and reduced stress on the drivetrain.

In Conclusion

How do you feel? Flashark has always been committed to providing users with reliable products and an unrivaled experience. Of course, we need your participation in this process! When considering modifications like tuning and deleting emissions systems in L5P Duramax engines, you must take a thoughtful and informed approach.  If considering tuning and deleting for off-road purposes, responsible driving practices and adherence to off-road guidelines are paramount.

If you have any further questions, please feel free to get in touch with us, the Flashark team is happy to help. If you have different opinions about Duramax, please let us know in the comment section below, we look forward to communicating with you.

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