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This is required for many 4l60-4l80e transmission swaps, adding flex fuel capability to most gen3 ecu, and some other cases. consult with us if your are unsure weather or not need to add this to your tune.
This is required for many 4l60-4l80e transmission swaps, adding flex fuel capability to most gen3 ecu, and some other cases. consult with us if your are unsure weather or not need to add this to your tune.