DIESELR 3.0L GM Duramax LM2 E66 All In One Kit (2021-2022)

3.0L Duramax LM2 E66 Tuning Kit for 2021–2022 (MPVI3 Platform)

Purpose-built for the 2020–2022 GM 1500 trucks equipped with the 3.0L Duramax LM2 E66 (Global B) platform, this DIESELR All-In-One Kit provides full ECM tuning support and precision calibration. Designed for truck owners who need compatibility with GM’s Global B architecture, this kit includes every required component to tune with HP Tuners MPVI3 and optimize performance and reliability off-road.

• Requires E66 ECM (Global B) to be unlocked (sold separately) - Click Here

What’s Included in the DIESELR LM2 E66 MPVI3 Kit:

• HP Tuners MPVI3 – BLANK
  Industry-leading OBDII tuning device for ECM access and control
• HP Tuners Universal Credits (6)
  Required for flashing the E66 ECM with custom files
• DIESELR MPVI3 E66 Tune Files (2021–2023 LM2)
  Single tune option, calibrated specifically for E66/Global B systems
• DIESELR EGR Upgrade Kit (2020–2022 LM2)
  Helps reduce soot, lower temps, and enhance flow
• DIESELR Cat & DPF Race Pipes (2020–2022 LM2)
  Stainless 16-gauge T409 system, designed for bolt-on fitment
• DIESELR 3" Turbo-Back Exhaust System (With Muffler)
  High-flow design, built for performance with quieter operation

Available Kit Variants:

• Year: 2020, 2021, 2022
• Tune Type: Single Tune Only
• Exhaust Type: Cat & DPF Race Pipe / 3" Turbo-Back w/ Muffler
• EGR Kit: Included

Why This LM2 E66 Kit Works:

• Built exclusively for E66/Global B Duramax platforms (2020–2022)
• MPVI3 and DIESELR tuning files tailored for drivability, towing, and reliability
• Exhaust and EGR upgrades improve airflow and reduce long-term engine strain
• Tune from your laptop—no ECM removal required

Exhaust System Features:

• Mandrel-bent 16-gauge T409 stainless construction
• Contour hangers and reinforced flanges for easy installation
• TorcTite® clamps ensure leak-free performance
• Retains stock muffler where applicable

Fitment:

• Compatible with 2020–2022 Chevrolet Silverado and GMC Sierra 1500 with 3.0L LM2 Duramax E66
• Not for on-road use or emissions-regulated vehicles

Install Notes:

• Requires Windows laptop and HP Tuners software for ECM flashing
• Tuning file revisions processed after form submission
• Remote tuning assistance available from DIESELR