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Best L5P Delete Kit: Top 4 Packages Reviewed
October 27, 2025

Best L5P Delete Kit: Top 4 Packages Reviewed

🔑 Key Takeaways

  • The L5P's factory emissions systems choke airflow—a proper delete kit can unlock 60-120+ horsepower and 2-5 MPG gains
  • 304 stainless steel kits offer superior corrosion resistance over aluminized steel, especially in rust-belt regions
  • The all-in-one DPF/EGR/CCV kit is the most comprehensive option, addressing all three emission systems in one package
  • All L5P delete kits require custom ECU tuning to disable emissions monitoring and prevent check engine lights
  • 2017-2019 and 2020-2023 model years require different fitment—make sure you order the correct year-specific kit

Unlocking the full potential of your Duramax L5P requires the right modifications. Choosing the best L5P delete kit can transform your truck's performance, reliability, and efficiency. This guide reviews the top 4 L5P delete kits available, explaining their features, benefits, and what makes each one stand out for different needs and budgets.

What to Look for in an L5P Delete Kit

Before exploring our top picks, understand what makes a quality L5P full delete kit:

Key Considerations

  • Material Quality: 304 stainless steel vs aluminized steel
  • Complete vs Partial Kits: What components are included
  • Installation Requirements: Professional vs DIY installation
  • Performance Goals: Horsepower targets and intended use
  • Budget: Investment vs expected returns

Why Choose a Delete Kit?

  • Increased horsepower and torque
  • Improved fuel economy
  • Reduced maintenance costs
  • Enhanced engine reliability
  • Better throttle response

Top 4 L5P Delete Kits for Power & Reliability

1. 2020-2023 6.6L Duramax L5P 4" DPF Delete Pipe & 3.5" Downpipe with EGR Delete Kit

This comprehensive L5P EGR delete kit offers exceptional value for late-model owners. The 4" DPF delete pipe provides optimal exhaust flow while maintaining ground clearance, and the 3.5" downpipe improves turbo spool-up significantly.

2020-2023 L5P Duramax 4" DPF & EGR Delete Kit - complete emissions delete system for off-road performance

Key Features:

  • Mandrel-bent piping for maximum flow efficiency
  • EGR block-off plates included for complete deletion
  • Direct bolt-on design requires no fabrication
  • Stainless steel construction for durability
  • Complete gasket and hardware kit included

Best For: 2020-2023 L5P owners seeking balanced performance and value.

2. 2020-2023 6.6L Duramax L5P 5" DPF Delete Pipe & 3.5" Downpipe with EGR Delete Kit

For maximum flow and aggressive sound, this 5" system stands out. The larger diameter piping reduces backpressure significantly, making it ideal for highly tuned applications and those planning future upgrades.

2020-2023 L5P Duramax 5" Exhaust System with 3.5" Downpipe - maximum flow delete kit for off-road use

Key Features:

  • 5" main piping for ultimate flow capacity
  • Aggressive exhaust tone without drone
  • High-quality T304 stainless steel
  • EGR delete components included

Best For: Enthusiasts seeking maximum performance and aggressive sound.

3. 2017-2019 6.6L Duramax L5P 4" DPF Delete Pipe & 3.5" Downpipe with EGR Delete Kit

Specifically designed for earlier L5P models, this kit addresses the unique requirements of 2017-2019 trucks. The precision fitment ensures easy installation and optimal performance for these specific model years.

2017-2019 L5P Duramax 4" DPF Delete Pipe Kit - year-specific design for early model performance

Key Features:

  • Year-specific engineering for perfect fitment
  • 4" balanced flow design
  • Complete EGR elimination
  • Aluminized steel option for budget-conscious buyers

Best For: 2017-2019 L5P owners wanting year-specific engineering.

4. 2017-2023 6.6L Duramax L5P DPF/CCV/EGR All-in-One Kit

The most comprehensive solution available, this L5P full delete kit addresses all major emissions systems in one package. Ideal for owners wanting a complete transformation and maximum reliability.

2017-2023 L5P Duramax Complete DPF/EGR/CCV Delete Kit - all-in-one emissions delete solution

Key Features:

  • Complete system deletion (DPF, EGR, CCV)
  • Universal fit for all 2017-2023 L5P models
  • Premium 304 stainless steel construction
  • Catch can included for CCV system
  • Professional-grade components

Best For: Owners seeking the most complete deletion solution available.

Installation Guide: What to Expect

Professional Installation

  • Time: 4-6 hours for complete installation
  • Cost: $400-800 depending on shop rates
  • Benefits: Warranty on workmanship, proper tuning integration

DIY Installation

  • Time: 6-10 hours for experienced mechanics
  • Tools Required: Basic hand tools, torque wrench, jack stands
  • Difficulty: Moderate to advanced mechanical skill required

Tuning Requirements

All L5P delete kits require custom tuning to:

  • Disable emissions monitoring systems
  • Optimize performance parameters
  • Prevent check engine lights
  • Maximize performance gains

Legal and Warranty Considerations

Emissions Compliance

  • Off-road use only in all 50 states
  • Not legal for vehicles driven on public roads
  • Potential fines for emissions tampering
  • State-specific regulations may apply

Warranty Implications

  • Voided powertrain warranty likely
  • Dealer detection possible even after removal
  • Consider warranty status before modification

Final Recommendation: Which L5P Delete Kit is Right for You?

Choosing the best L5P delete kit depends on your specific needs

For premium L5P delete kits and expert advice, visit www.seguler.com to find your perfect solution.

FAQs About L5P Delete Kits

Q1: What is included in a complete L5P delete kit?

A1: A complete L5P full delete kit typically includes DPF delete pipe, downpipe, EGR delete components, all necessary gaskets, hardware, and sometimes CCV modification parts.

Q2: How much horsepower gain can I expect?

A2: Most quality L5P delete kits provide 60-120+ horsepower gains depending on the kit quality, supporting modifications, and tuning.

Q3: Are L5P delete kits legal for street use?

A3: No, all delete kits are for off-road use only. They are not legal for vehicles driven on public roads due to emissions regulations.

Q4: Can I install a delete kit myself?

A4: Yes, if you have advanced mechanical skills and proper tools. However, professional installation is recommended for most owners.

Q5: Will deleting my L5P improve fuel economy?

A5: Yes, most users report 2-5 MPG improvements due to reduced backpressure and elimination of DPF regeneration cycles.

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