Chaos Custom Tuning MPVI4 Tune Files (2020-2023 Duramax L5P 6.6L)The Chaos MPVI4 L5P Tune Files 20202023 are built for Duramax owners who want cleaner throttle control, stronger low end torque, and consistent drivability from the 6. 6L platform. These calibrations are designed for the HP Tuners MPVI4 interface and deliver a more refined driving feel compared to stock mapping. Chaos Custom Tuning has a long track record of building files that work on both stock and lightly upgraded trucks. Whether your L5P is
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