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The HP Tuners E41 Upgrade Kit lets you upgrade the E41 ECM on a 2017-2023 Silverado or Sierra 2500HD/3500HD with the 6.6L L5P Duramax without removing it from the truck. The job takes 20 minutes or less. Once it's done, the ECM supports read, write and special functions in VCM Suite, HP Tuners' tuning software.
Fitment
The E41 ECM is foun
