An LMM EGR delete plate is a simple but effective upgrade for 2007.5–2010 6.6L Duramax LMM engines. It is designed to block or bypass the factory EGR (Exhaust Gas Recirculation) system, helping reduce intake contamination, improve airflow, and support better long-term engine reliability.

Many Silverado and Sierra owners choose an EGR delete plate as part of a larger performance or reliability-focused setup, especially for towing or high-mileage trucks.

What Is an LMM EGR Delete Plate?

An LMM EGR delete plate is a metal block-off component installed in the EGR system pathway. Its main purpose is to stop exhaust gases from being routed back into the intake manifold.

A typical setup includes:

• EGR block-off plate (intake side)
• Exhaust side block plate (depending on kit design)
• High-temperature gasket
• Mounting bolts and hardware

Some setups use a single plate, while more complete kits include multiple plates and coolant bypass parts.

Benefits of an LMM EGR Delete Plate

Installing an LMM EGR delete plate can improve engine cleanliness and performance in several ways.

Cleaner Intake System

By stopping exhaust gas recirculation, carbon buildup inside the intake is significantly reduced.

Improved Airflow

Cleaner air entering the engine helps improve combustion efficiency.

Better Throttle Response

Reduced soot and restriction can make the engine feel more responsive during acceleration.

Lower Intake Temperatures

Less hot exhaust gas entering the intake system helps reduce heat stress.

Reduced Maintenance Needs

Owners often experience fewer intake cleanings and reduced EGR-related repairs.

When an EGR Delete Plate Is Used

An LMM EGR delete plate is commonly used in:

• High-mileage Duramax trucks
• Performance or towing builds
• Off-road or competition setups
• Trucks with repeated EGR failure issues

It is often combined with other modifications like exhaust upgrades and tuning for better results.

Types of LMM EGR Delete Plates

There are different styles of LMM EGR delete plate setups depending on how complete the modification is.

Basic Block-Off Plate

• Simple design
• Blocks EGR flow only
• Budget-friendly option

Dual Plate Kit

• Intake and exhaust block-off plates
• Better sealing and reliability
• More complete airflow control

Full EGR Delete Kit (with bypass)

• Includes plates + coolant reroute
• Removes full EGR system
• Best for long-term reliability builds

Importance of Proper Installation

Correct installation of an LMM EGR delete plate is very important to avoid leaks or performance issues.

Basic installation steps include:

1. Remove intake components
2. Access EGR valve and connections
3. Install block-off plate(s)
4. Replace gaskets and bolts
5. Reassemble intake system
6. Check for air or coolant leaks

Proper torque and sealing are critical for long-term reliability.