EGR Performance L5P EGR Delete Kit for 2017-2025 6.6L Duramax Diesel

Product Overview

The L5P EGR delete kit replaces your factory exhaust gas recirculation (EGR) valve and cooler with precision-machined block-off plates and high-flow coolant reroute hoses. By stopping hot exhaust gases from re-entering the intake, it prevents carbon soot from clogging critical engine components.

This directly reduces engine operating temperatures and extends the life of your turbocharger and intake system. Every kit includes billet aluminum construction, nickel-plated steel flanges, and high-temperature silicone hoses for a leak-free seal.

Designed as a direct bolt-on for the 2017-2025 6.6L L5P Duramax, installation takes approximately 2 hours with basic hand tools.

Complete your L5P build: This kit works best as part of a matched off-road package. Start with the full L5P EGR delete lineup to pair the delete with the rest of your build.

For lower exhaust backpressure, add the L5P DPF delete kit, then seal the intake with the L5P CCV reroute ventilation kit for a fully soot-free engine bay.

Ideal For

• Towing and Hauling: Lower EGTs and improved exhaust flow help your L5P Duramax maintain power under heavy loads, reducing heat soak during long climbs.
• Daily Driving: Eliminating EGR soot buildup keeps your intake clean, preserving smooth idle and consistent throttle response for everyday commuting.
• Off-Road Use: Built for off-road and race-use builds, this kit removes a common heat-related failure point in demanding terrain where low-speed, high-load conditions stress the EGR cooler.
• Commercial Vehicles: Fleets and work trucks benefit from reduced maintenance intervals and fewer EGR-related diagnostic issues over high-mileage operation.
• Engine Performance Upgrades: An essential companion to DPF delete tuners and custom tuning, this kit is the foundation for any serious L5P performance build.
• Long-Term Vehicle Ownership: Preventing soot accumulation and EGR valve clogging reduces long-term repair costs and extends the service life of your engine.

Core Advantages

• Increased Horsepower and Torque: Removing the restrictive EGR system improves exhaust flow, allowing the turbocharger to spool faster and deliver more usable power across the RPM range.
• Improved Fuel Efficiency: With cooler, denser, clean air entering the combustion chamber, your engine burns fuel more efficiently. Many owners report a measurable MPG increase after tuning.
• Reduced Engine Temperature: By eliminating hot exhaust gas recirculation, intake air temperatures drop significantly, reducing overall engine heat and EGTs under load.
• Extended Engine Life: Preventing soot buildup in the intake manifold, EGR valve, and turbocharger reduces wear on critical components and avoids costly EGR cooler failures.
• Direct Bolt-On Installation: Precision-engineered flanges and O-rings ensure a perfect fit, with no cutting, welding, or modification required for the 2017-2025 L5P Duramax.
• All-In-One Kit: Everything needed for a complete install is included, block-off plates, gaskets, silicone hoses, hardware, and a stainless steel dipstick tube bracket.

Technical Specifications

• Material: Solid carbon steel (main delete pipe), billet aluminum (block-off plates), nickel-plated steel flanges
• Finish: Zinc-plated hardware, high-temperature black coating on steel components
• Weight: Approximately 6 lbs
• Dimensions: 18 x 10 x 6 inches (packaged)
• Maximum Temperature Resistance: 1,500°C (2,732°F), 2.5x the rating of stock aluminum components
• Warranty: 1 Year Limited Warranty against manufacturing defects

Why Choose EGR Performance

• Premium Quality Materials: Solid carbon steel construction rated to 1,500°C, paired with billet aluminum and high-temp silicone for unmatched durability.
• Precision Engineering: Every flange, bracket, and hose is CAD-designed and CNC-machined for an exact fit on the 2017-2025 L5P Duramax.
• Rigorous Testing: Each kit undergoes pressure testing, heat cycling, and real-world off-road validation before release.
• Dedicated Customer Support: Email us at service@egrperformance.com for fitment questions, technical support, or VIN verification.
• Fast Shipping from USA Warehouse: Orders ship within 24 hours from our domestic warehouse.
• 1 Year Limited Warranty: Full coverage against manufacturing defects.

Troubleshooting and Problem Solving

Common Issues After Installation

• Check Engine Light: Almost always caused by a missing EGR-related DTC disable in the tune. A DPF-delete-capable tuner is required.
• Rough Idle: May indicate an intake leak or improper gasket seating. Recheck all block-off plate connections and torque to spec.
• Reduced Power: Often caused by an unmetered air leak or boost leak. Inspect all silicone hose connections and hose clamps.
• Coolant or Oil Leaks: Check coolant reroute hose connections and O-ring seals. Tighten hose clamps and verify gasket seating.
• Coolant Overheating: Make sure the coolant system is properly bled and the reroute hose is not kinked or restricted.

Error Code Solutions

• (P0401) EGR Flow Insufficient Detected: The ECM no longer detects EGR flow. Requires a custom tuner to disable the EGR system in the ECM calibration.
• (P0402) EGR Flow Excessive Detected: Incorrect EGR flow signal. Verify all EGR electrical connectors are properly disconnected and use a tuner to disable EGR DTCs.
• (P0403) EGR Circuit Malfunction: Open or short in the EGR control circuit. Make sure the EGR valve electrical connector is fully disconnected and insulated, then disable via tuner.
• (P0404) EGR Position Sensor Circuit Range or Performance: The EGR position sensor is no longer sending valid data. Disable EGR-related DTCs with a DPF-delete-capable tuner.
• (P0405) EGR Position Sensor A Circuit Low: Low voltage signal from the removed EGR sensor. Confirm the connector is disconnected and disable the code via custom tuning.

How to Reset Check Engine Light After Installation

1. Confirm all mechanical connections are secure and no leaks are present.
2. Connect a DPF-delete-capable tuner to the OBD-II port.
3. Flash a custom EGR or DPF-delete tune that disables all EGR-related diagnostic trouble codes.
4. Clear all stored DTCs using the tuner's clear function.
5. Start the engine and let it idle for 5 minutes, then test drive to confirm no codes return.
6. If the light persists, recheck for intake or boost leaks before re-flashing.

What to Do If Your Vehicle Loses Power After Installation

• Check for boost leaks: Spray soapy water on all silicone hose connections and intercooler boots while the engine is running. Bubbles indicate a leak.
• Verify the tune is loaded: A stock or incomplete tune will trigger limp mode. Confirm the EGR or DPF-delete tune is fully flashed.
• Inspect the MAF sensor: Make sure the mass airflow sensor is clean and properly connected after reinstallation.
• Check air filter condition: A clogged or improperly seated air filter can restrict airflow and reduce power.
• Monitor EGTs: Excessively high exhaust gas temperatures may indicate a fueling or tuning issue. Consult your tuner.

Long-Term Maintenance Tips

• Regular Inspection: Every 5,000 to 10,000 miles, inspect all block-off plates, gaskets, and silicone hose connections for signs of leakage, cracking, or loosening.
• Routine Maintenance: Check coolant level and condition at every oil change. Flush and replace engine coolant every 50,000 miles or per manufacturer specification.
• Wear Parts Replacement: High-temperature silicone hoses should be inspected every 30,000 miles and replaced if cracking, bulging, or softening is observed.
• Hardware Check: Every 10,000 miles, verify that all mounting bolts and hose clamps are torqued to specification, and re-tighten if necessary.
• Storage Tips: If the vehicle will sit for extended periods, make sure the cooling system is full and the battery is maintained on a trickle charger to prevent seal drying.
• Warranty Reminder: Following these maintenance guidelines keeps your 1 Year Limited Warranty valid.