6.6L Duramax L5P EGR Delete Kit | GMC/Chevy 2017-2025

Introduction

The GM Duramax L5P – EGR & Cooler Delete Kit (2017–2025) removes the factory EGR valve and cooler to cut heat, soot, and failure points on 6.6L L5P platforms. Expect lower EGTs, steadier coolant temps and cleaner airflow for off-road performance. Custom tuning is required.

Features

• Complete EGR and cooler removal for 2017–2025 L5P Duramax
• CNC-fit aluminum and steel block-off plates for leak-free sealing
• Pre-assembled coolant hoses for a clean, fast install
• Full hardware and gasket set included
• Designed to reduce backpressure and lower exhaust gas temperatures
• For off-road/competition use; tuning mandatory

Benefits

• Power and response: Quicker turbo spool and stronger mid-range
• Towing confidence: Lower EGTs under sustained load
• Efficiency: Potential fuel economy gains with proper calibration
• Reliability: Fewer EGR-related clogs, leaks, and CELs
• Longevity: Less heat and soot stress across engine systems

Compatibility

• Years: 2017-2025
• Makes: Chevrolet Silverado, GMC Sierra
• Models: 2500, 3500, 4500, 5500
• Engine: 6.6L Duramax L5P (Diesel)
• Body: Pickup and Heavy Duty

Direct integration with L5P architecture; verify body style and accessory clearance before install

Technical Specifications

Kit includes:

• 3 × Coolant hoses with pre-installed fittings
• 1 × Aluminum block-off plate
• 2 × Steel block-off plates
• 4 × Grade 8.8 bolts
• 1 × Vacuum cap
• 2 × Hose clamps
• 3 × Exhaust gaskets
• 3 × Turbo gaskets
• 1 × Aluminum 9th-injector block-off plug
• 1 × Aluminum coolant-hose block-off plug

Materials: Aluminum and coated steel plates, silicone/formed coolant lines

Typical install time: 4–8 hours depending on tools and experience

Installation & Notes

Order of operations: Tune the vehicle first, confirm communications and no DTCs, then remove emissions parts and install the kit

Difficulty: Moderate; hand tools and coolant service required

Checks: Verify gasket seating, torque fasteners to spec, bleed cooling system, re-check after first heat cycle

Legal disclaimer: Off-road/competition use only. Not legal for highway use. Confirm local, state, and federal regulations

Shipping: Review shipping instructions and lead times before purchase