Do you need to return to the stock tune before you use a different performance tune, or can you change from one tune to another w/o returning to stock first i.e.. 3.55 to 4,10?
All on the same tuner.
Just wondering as the tuner didn't come with directions.
you just re-program the car with the changes for the gearing, no need to revert to stock first. Going back to stock is only to divorce the handheld from the PCM.
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