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I see most are read wright 3/3 what will 4 allow you to do.. Just courious

It allows you to write engine builder (factory) parameters for new engine groups.

There are new CPC parameters for newer engine models. Level 4 along with hardware level 10 allows access to not only read them but modify them. For users with Read 3, Write 3, and HW 10 they would be able to see these parameters and they would show up not grayed but you could not change them. It enables some extra features within the program too.