I don't know much about the fuel pack, but my guess is the "legal" stage one would be a leaner map than the Stage 1 "Street".These are two of the options for Fuelpak configuration, Stage 1 1584 Legal and Stage 1 Street, I was just curious how they differed.
Its asking what your ECM level is prior to ever installing a FP, Apparently those are dealer downloads or it wouldnt be asking what your ECM level is on the FP configurator.You should mention that in the top post that you were talking about a fuel pack and not a dealer download.
Its nothing to do with the FP, its just one of the questions that you have to answer within the FP configurator to figure out what settings you should apply to the FP upon installation.I don't know much about the fuel pack, but my guess is the "legal" stage one would be a leaner map than the Stage 1 "Street".