You do not have to do the auto relearn or have anything flashed for the Automatic trans when you switch back and forth, the shift settings are in the PCM, not the trans when you put the S0 back in it will shift normal, and when you put the S1 back in it will have the upgraded shifts and the mileage is not programmed in the PCM, it is put in a data base when you order it so that DC knows when you installed it.
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