What Does an EGR ...
Aug 09, 2025
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)
Removes the EGR valve & cooler to prevent carbon buildup.
Best for reducing intake temps and improving longevity.
Eliminates the Diesel Particulate Filter, reducing exhaust backpressure.
Requires a tuner to disable regens and prevent check engine lights.
Removes all emissions components for maximum performance.
Best for off-road/track use only due to emissions laws.
+3-5 MPG (less exhaust restriction)
+50-100+ HP (better airflow & tuning potential)
Longer turbo & engine life (reduced heat & soot buildup)
Voided warranty (if still active)
Check engine lights (requires tuning)
Possible fines if not for off-road use
🚨 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.
Includes block-off plates and necessary hardware.
Reduces intake temps for better performance.
Mandrel-bent stainless steel for smooth airflow.
Pairs with an EFI Live or HPTuners custom tune.
EFI Live (best for custom tuning)
H&S Mini Maxx (user-friendly)
Duramaxtuner (pre-loaded options)
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!