So bought mpvi2 to make a couple dtc modifications on this 2011 duramax and the truck has previously been tuned and deleted. Now when I pull the data from the ecm it say it's retrieved stock data and it's safe to use. Now my question if I disable a couple dtcs and write is it going to write a stock file and wipe out the deletes and tuner that's already installed. Sorry if this a stupid question rather be safe than sorry