GDP MPVI4 E66 (Global B) Tune Files (2021-2025 Duramax LM2 3.0L)GDP MPVI4 E66 (Global B) Tune Files (20212025 Duramax LM2 3. 0L) The GDP MPVI4 E66 (Global B) Tune Files are designed specifically for the 20212025 3. 0L Duramax LM2 engine. These calibrations work with the newer E66 ECM found in GMs Global B platform and require an ECM unlock service before tuning can begin. Once unlocked, the files are applied using the MPVI4 interface and six HP Tuners Universal Credits. This file package provides two selectable
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GDP MPVI4 E66 (Global B) Tune Files (2021-2025 Duramax LM2 3.0L)