Replacing the ECM and TCM in my L5P Duramax with HP Tuners unlocked ECM and TCM. Tuning my truck with some Switch on the Fly Emissions Compliant Tunes from Duramaxtuners.com aka Calibrated Power.

If you are interested in tuning for your diesel truck, check out Calibrated Power / Duramaxtuner -
https://duramaxtuner.com/

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