6.6L Duramax L5P Delete Kit | Complete DPF/DEF/EGR Delete | GM 2017–2025

Introduction

GM Duramax L5P All-In-One Delete Kit (2017-2025) is built for owners who want a complete, tuner-ready off-road solution without piecing together hardware, tuning and exhaust from multiple sources. This L5P delete kit is designed to address the real-world issues every L5P owner runs into once mileage, towing, or aggressive use starts exposing the limits of factory DPF, DEF, and EGR systems. If you're tired of derates, rising EGTs, and emissions components that don't tolerate hard use, this kit gives you a clean path forward delete, tune, and move on.

Please Note: 2024 to 2025 L5P ECM's must be sent to HP tuners to be unlocked before it can be tuned (NOT INCLUDED)*

What's Included in the L5P All in One Delete Kit

List of Items Included EGR & Cooler delete kit

• 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

Everything included is chosen to work together: the tuning interface with the correct number of credits for your year, the appropriate tuning package, a full EGR and cooler delete, necessary block-off plates and hardware, exhaust gaskets, turbo gaskets and your selected exhaust configuration. If you want to take it further, optional TCM tuning and upgraded downpipes are available to refine shift strategy and maximize exhaust flow.

Important: 2024-2025 L5P models require E42 service, which is not included in this kit.

• Power gain range: varies by tune and supporting mods
• Operating range: designed for race use; lower EGTs when properly calibrated

Vehicle Compatibility

Year / ECM Notes

• 2017-2019: E41 ECM (Unlock Tool compatible)
• 2020-2023: E41 ECM (Unlock Tool supported with updated process)
• 2024-2025: E42 ECM — requires E42 service (not included in kit)

Select your year set during configuration: 2017-2019, 2020-2023 or 2024-2025

Fitment is year and ECM-specific, which is why you select your exact model range when ordering. 2017-2019 trucks use the E41 ECM and are fully compatible with the Unlock Tool process. 2020-2023 duramax l5p engine trucks still run E41 hardware with an updated unlock procedure. 2024-2025 trucks use the newer ECM platform and require external unlock service before tuning. This attention to platform differences is what separates a complete l5p duramax delete kit from a generic bundle of parts.

Customization Steps

1. Year Selection: 2017-2019, 2020-2023, or 2024-2025 GM Sierra/Silverado 2500/3500 L5P Duramax.
2. Exhaust System: Straight delete pipe, 4″ Exhaust or 5″ Exhaust for maximum flow.

Note: 2024-2025 duramax tunes are single calibration only and require separate E42 service. No SOTF options available.

Features

• Pre-tune requirement: Always flash the calibration before removing hardware
• Unlock Tool Upgrade:
  • 2017-2023: Unlock Tool Upgrade included (No ECM replacement, immobilizer, or crank relearn)
  • 2024-2025: HP Tuners unlock service required (ECM's must be sent to HP tuners to be unlocked before it can be tuned, service not included with this product)
• OBD2 Flash Delete Tuning Interface:
  • 4 credits for 2017-2023
  • 8 credits for 2024-2025
• 5-Level SOTF tuning package (2017-2023 only): 0HP / 50HP / 75HP / 100HP / 150HP Switch On The Fly
• Complete Duramax EGR Delete Kit
• CAN BUS plug kit (2017-2023 only)
• 2024-2025 variant is a single calibration tune (no SOTF)
• Exhaust options: Straight L5P DPF delete pipe, 4' downpipe-back exhaust, or 5' downpipe-back exhaust.

Benefits

• Power & torque: Optimized fueling + free-flowing exhaust = instant gains
• Lower EGTs: Less restriction keeps temps safer under load
• Drivability: Smooth shifts and stronger mid-range with custom tunes
• Reliability: Deletes failure-prone emissions parts, reducing derates
• Simplicity: Unlock Tool Upgrade avoids ECM swaps and relearn steps

Shipping & Tuning Details

• Lead times depend on year and configuration. 2024-2025 kits may require additional prep due to E42 service requirements.
• Review the installation instructions before beginning.
• Tuning and hardware setup are detailed processes. We appreciate your patience during order preparation.

Optional Add-Ons

• Discover the TCM Tuning Upgrade Kit: Improve shift strategy and drivability.
• GM Duramax L5P 3.5' Down-Pipe Helps maximize results by removing the DOC after the turbo.