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Is it necessary to flash back to stock prior to changing to a different custom tune? Thanks
 

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I have a SCT2 and it is not necessary to flash back to stock.
 

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Yep, the tuner will keep the stock as a backup, but definitely not necessary to revert back to stock to start anew. It is nice to have that option though if you find yourself with a tune that seems to be unsalvagable.
 
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