2007.5-2010 6.6L GM Duramax LMM EGR &Cooler Delete Kit with Intake Elbow
Maximize the efficiency and power of your 6.6L Duramax LMM with our professional EGR Delete Kit. Designed for 2007.5–2010 Chevrolet Silverado and GMC Sierra 2500HD/3500HD trucks, this kit is the ultimate solution to eliminate the problematic factory EGR system and replace the restrictive stock intake path with a High-Flow Intake Elbow.
By removing the EGR cooler and valve, you stop hot, soot-filled exhaust gases from recirculating into your engine. When paired with our high-flow intake elbow, your LMM receives a massive increase in clean air volume, resulting in lower EGTs and significantly improved throttle response.
Choose Your Performance Level
We offer two configurations tailored to your specific truck build:
1. Performance Version (With High-Flow Intake Elbow)
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Maximum Airflow: Replaces the restrictive factory intake pipe with a smooth, mandrel-bent elbow that eliminates air turbulence.
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Lower Intake Temps: Optimized design reduces air intake temperatures (IATs), directly improving combustion efficiency and power output.
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Built for Power: The ideal choice for tuned trucks, heavy towing, or those running larger turbochargers.
2. Standard Version (EGR Removal Only)
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Reliability Focus: Removes the failure-prone EGR cooler and valve while retaining the factory intake setup.
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Soot Prevention: Effectively stops carbon buildup and prevents the risk of EGR cooler leaks.
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Cost-Effective: A budget-friendly solution for daily drivers seeking long-term engine longevity without the need for additional airflow upgrades.
Key Performance Benefits
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Boost Fuel Efficiency: By allowing the engine to breathe fresh air, many LMM owners report fuel economy gains of up to 20%.
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Engine Longevity: Prevents abrasive soot from contaminating engine oil and clogging intake valves, extending the life of internal components.
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Reduce Thermal Stress: Lower coolant and oil temperatures by removing the EGR cooler from the engine’s cooling circuit.
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Protect the DPF: Cleaner combustion reduces the soot load on the Diesel Particulate Filter (DPF), potentially lowering the frequency of regeneration cycles.
Technical Specifications
| Attribute |
Detail |
| Engine Compatibility |
6.6L V8 Duramax (LMM Engine Code) |
| Model Years |
2007.5, 2008, 2009, 2010 |
| Vehicle Fitment |
Chevy Silverado / GMC Sierra 2500HD & 3500HD |
| Intake Elbow |
High-Flow Mandrel-Bent Construction (Included in Performance Kit) |
| Hardware |
CNC-Machined Plates & High-Temperature Gaskets |
| Usage |
Off-Road & Competition Use Only |
Why Upgrade Your LMM Duramax?
The LMM was the first Duramax generation to face heavy emissions restrictions. Over time, the EGR system becomes a "clogging point," forcing the engine to work harder and run hotter. This LMM EGR Delete & Intake Elbow kit restores lost power and simplifies the engine bay, making it a "must-have" for any owner looking to bulletproof their 2007.5–2010 Super Duty truck.
Frequently Asked Questions (FAQ)
Q: Will I need a tuner for this kit?
A: Yes. An EGR-delete capable performance tuner is required to disable the factory software and prevent Check Engine Lights (CEL).
Q: Can I install this with a stock turbo?
A: Absolutely. This kit is a direct bolt-on for stock turbos and provides a great foundation for future performance upgrades.
Q: Does the High-Flow Elbow help with towing?
A: Yes. The increased airflow helps lower Exhaust Gas Temperatures (EGTs), which is critical for maintaining engine safety when pulling heavy loads.
General Performance & Technical Questions
Q1: What are the primary benefits of an EGR delete on a Duramax?
- Engine Longevity: Stops abrasive soot and carbon from entering your intake manifold and scoring cylinder walls.
- Lower EGTs: Reduces overall engine operating temperatures by eliminating the recirculation of hot exhaust gases.
- Improved MPG: Many owners report up to a 20% increase in fuel economy when paired with a proper off-road tune.
- Turbo Protection: Prevents "carbon choking" of the turbocharger vanes and intake valves, extending the life of your top-end components.
Q2: What tools are required for installation?
- You will need a standard set of metric sockets, wrenches, and screwdrivers. Since the EGR cooler is integrated into the cooling system, you will also need coolant catch pans and fresh Dex-Cool to refill the system after the reroute.
Q3: Will an EGR delete damage my engine?
- No. When installed correctly with supporting tunes, it actually improves reliability. It optimizes airflow, reduces thermal stress on the head gaskets, and prevents the common "clogged EGR" issues that lead to expensive repairs.
Q4: Will removing the EGR cause my truck to smoke?
- With a high-quality "clean" tune (from platforms like EFI Live or EZ Lynk), your truck should not produce excessive black smoke. Without proper tuning, the air-fuel ratio will be unbalanced, leading to poor combustion and heavy smoke.
Q5: Is an EGR delete legal for street use in the U.S.?
- No. These kits are sold strictly for OFF-ROAD / RACING USE ONLY. Under EPA federal law, removing emissions equipment from a vehicle operated on public highways is illegal and will cause the vehicle to fail emissions inspections (Smog Checks).
LLY (2004.5–2005) Specifics
Q6: Does the LLY kit include a high-flow intake pipe?
- Yes. Most LLY kits feature a high-flow intake bridge designed to replace the restrictive factory piece, significantly increasing airflow for your 2005 Duramax.
Q7: Can I install the 2005 LLY kit myself?
- Yes. The LLY is a very DIY-friendly platform. It is a direct bolt-on solution that typically takes 2–3 hours for an experienced enthusiast with basic hand tools.
LMM (2007.5–2010) Specifics
Q8: Which trucks are compatible with the LMM kit?
- This kit is specifically for 2007.5–2010 Silverado and Sierra 2500/3500 HD models equipped with the 6.6L LMM engine.
Q9: How long is the installation for an LMM Duramax?
- Due to the engine bay layout, the LMM is more labor-intensive than the LLY. Expect a 4–6 hour installation time.
LML (2011–2016) Specifics
Q10: What materials are used in the LML delete kit?
- Our LML kits are manufactured from CNC-machined billet aluminum and high-grade stainless steel to ensure they handle the high boost pressures and heat cycles of the 6.7L platform.
Q11: Is this compatible with a 2015 Chevrolet Silverado?
- Yes. It is fully compatible with 2011–2016 LML models, including the 2015 Silverado/Sierra 2500 and 3500 HD.
L5P (2017–2025) Specifics
Q12: What does the L5P EGR delete improve?
- By removing the EGR valve and cooler on the 2017+ L5P, you allow the engine to pull in 100% fresh, oxygen-rich air. This results in more consistent torque and lower coolant temperatures—highly noticeable when towing heavy loads.
Q13: Is the L5P installation complicated?
- While the L5P engine bay is compact, the kit is designed for a precise fit. Most DIYers can complete the installation within a few hours. Note: L5P tuning is specialized; ensure your ECM is unlocked and ready before starting the physical install.
Troubleshooting & Maintenance
Q14: Will this kit fix the issue of intake heater bolts falling into the engine?
- No. This kit deletes the EGR system. The "heater grid bolt" issue is a separate hardware failure. If you are concerned about those bolts, we recommend a "Grid Heater Delete" in addition to this kit.
Q15: Will my truck pass emissions with this kit?
- No. Removing the EGR system is a "fail" for visual and OBDII emissions scans in states that require testing.
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All Dieselperf products enjoy a 1-year limited warranty starting from the date of goods receipt, covering defects in product materials and workmanship.
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The 1-year limited warranty does not apply to the following circumstances:
- Normal wear and tear and surface scratches generated during regular use
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