LML Delete Kit Guide: DPF, EGR & DEF System Removal Explained

LML EGR Delete Kit for 2011-2016 6.6L Duramax Trucks

Why LML Owners Consider Deletes (DPF Clogging, DEF System Failures)

The 2011-2016 6.6L LML Duramax introduced stricter emissions systems, including:

  • Diesel Particulate Filter (DPF) – Traps soot but clogs over time, reducing power and fuel economy.

  • Exhaust Gas Recirculation (EGR) – Recirculates exhaust gases, increasing carbon buildup and heat.

  • Diesel Exhaust Fluid (DEF) System – Injects urea to reduce NOx emissions but can fail, causing limp mode.

An LML delete kit removes these restrictions, improving:

✔ Engine performance (better throttle response & horsepower)
✔ Fuel efficiency (less backpressure from DPF)
✔ Long-term reliability (no more clogged filters or DEF headaches)


Types of LML Delete Kits: EGR vs. DPF vs. Full Delete

1. EGR Delete Kit

  • Removes the EGR valve & cooler to prevent carbon buildup.

  • Best for reducing intake temps and improving longevity.

  • Recommended EGR Delete Kit

2. DPF Delete Kit

  • Eliminates the Diesel Particulate Filter, reducing exhaust backpressure.

  • Requires a tuner to disable regens and prevent check engine lights.

3. Full Delete Kit (EGR + DPF + DEF)

  • Removes all emissions components for maximum performance.

  • Best for off-road/track use only due to emissions laws.


Performance Gains & Potential Risks

✅ Benefits of Deleting Your LML Duramax

  • +3-5 MPG (less exhaust restriction)

  • +50-100+ HP (better airflow & tuning potential)

  • Longer turbo & engine life (reduced heat & soot buildup)

⚠️ Risks & Considerations

  • Voided warranty (if still active)

  • Check engine lights (requires tuning)

  • Possible fines if not for off-road use


Legal Implications & Off-Road Use Disclaimer

🚨 Important: Deleting emissions systems is illegal for on-road use in the U.S. and Canada.

  • EPA regulations prohibit tampering with DPF, DEF, or EGR systems.

  • Some states (CA, NY, etc.) enforce strict emissions testing.

  • Off-road/racing use only – Always check local laws before modifying.


Top-Rated LML Delete Kits & Tuner Recommendations

1. LML EGR Delete Kit (2011-2016)

  • Includes block-off plates and necessary hardware.

  • Reduces intake temps for better performance.

2. Full DPF/DEF Delete Pipe

  • Mandrel-bent stainless steel for smooth airflow.

  • Pairs with an EFI Live or HPTuners custom tune.

3. Recommended Tuners

  • EFI Live (best for custom tuning)

  • H&S Mini Maxx (user-friendly)

  • Duramaxtuner (pre-loaded options)


Final Thoughts

An LML delete kit can transform your Duramax’s performance, but always consider legal and warranty implications. For off-road use, a full delete with tuning delivers the best results.

🛠 Ready to upgrade? Explore top-rated LML performance parts today!

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