2021–2023 Chevy GMC 3.0L Duramax LM2 E66 ECM Send-In DPF DEF EGR Delete Kit | Dyno Diesels

2021–2023 Chevy / GMC 3.0L Duramax LM2

E66 ECM Send-In Complete Delete Kit

Dyno Diesels | Full Calibration Control. Prehistoric Precision.

Dyno Diesels now offers full tuning and delete support for select GM platforms running the E66 ECM, unlocking true calibration access on late-model 3.0L Duramax LM2 engines found in half-ton trucks and full-size SUVs.

This is not a basic flash or limited workaround. With the proper ECM upgrade, you gain complete control over fueling, torque management, shifting behavior, throttle response, and towing performance—all backed by professional support and proven calibration strategies.

⚠️ ECM MUST BE VERIFIED
This kit is for E66 ECM ONLY.
If your vehicle uses an E46 ECM, you must select the alternate option without the ecm being sent in. 

Supported Vehicles

• 2021–2023 Cadillac Escalade 3.0L Duramax LM2
• 2021–2023 Chevrolet Suburban & Tahoe 3.0L Duramax LM2
• 2022–2022.5 Chevrolet Silverado 1500 3.0L Duramax LM2
• 2022–2022.5 GMC Sierra 1500 3.0L Duramax LM2
• 2021–2023 GMC Yukon 3.0L Duramax LM2

What This Kit Unlocks

Once upgraded, the E66 ECM allows:

• Full calibration control
• Advanced diagnostics & scanning
• Cleaner, more consistent shifting
• Reduced throttle lag
• Optimized towing behavior
• Improved drivability and responsiveness

This is day-to-day performance you can feel, not just peak numbers.

⚠️ IMPORTANT – ECM SEND-IN REQUIRED

• ECM must be sent in for upgrade
• We pay shipping and provide a prepaid return label
• Shipping instructions and address are sent after checkout
• ALL WORK MUST BE PERFORMED WITH GDP TECH SUPPORT (new-release platform)

What’s Included

• Prepaid ECM Send-In Upgrade (E66 only)
• E66 Tune File
• Tuning Interface – flash-ready once ECM is returned
• Credits (used to license the ECM post-upgrade)
• LM2 CAN Bus Plugs
• 3.0L Duramax DPF Delete Pipe (retains factory muffler)

Optional Add-Ons (Must Be Selected in Menu)

⚠️ Not included unless selected

EGR Delete Kit – 3.0L Duramax LM2

This kit removes the restrictive factory EGR system, reducing soot buildup and improving airflow.

Kit Includes:

• High-quality 4-ply silicone coolant hose (1)
• Coolant caps (2)
• Ground cable (1)
• Block-off plates for EGR valve & cooler (2)
• Intake plug (1)

Deletes:

• EGR cooler
• EGR valve
• Exhaust valve
• EGR cooler pipe

Benefits:

• Cleaner intake air
• Reduced carbon buildup
• Improved combustion efficiency
• Smoother engine operation
• Increased long-term reliability

Cold Air Intake (Optional)

High-flow intake option available for improved airflow and throttle response.

DPF / CAT Delete Pipe Details

• Fabricated from durable 16-gauge stainless steel
• Precision-fit with machined flanges
• Lap-joint style clamps for secure installation
• Reduces exhaust restriction and EGTs
• Retains factory muffler for controlled sound

Installation Notes

• Professional installation strongly recommended
• OEM EGR and exhaust components require engine bay disassembly
• Not a beginner-level install

Dyno Diesels Philosophy

Late-model diesel platforms require precision, patience, and real calibration access—not shortcuts. This LM2 E66 kit reflects the Dyno Diesels mindset: remove restrictions, unlock control, and build performance that lasts.

Dyno Diesels — Dyno-proven control. Prehistoric reliability. No extinction events.