DIESELR MPVi4 E66 (Global B) Tune Files (2021-2026 Duramax LM2 & LZ0 3.0L)The DIESELR MPVI4 E66 Tune Files (20212026 Duramax 3. 0L LM2 & LZ0) are engineered to give GM truck and SUV owners a proven way to improve drivability, throttle response, and fuel efficiency. Built on the HP Tuners platform, these calibrations are tailored for vehicles running the E66 ECM (Global B) and provide a reliable solution for the modern 3. 0L Duramax lineup. Compatible with both LM2 and LZ0 engines, these tune files work across a wide range
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