So you ordered the wrong tune and there is a price difference. Well here is your lucky chance to fix that and be a good human being. Or you need a tune revision and it has been 1+ years since tune purchase (select $300 for the new tune revision).
Also applicable for those who may have been on multiple map's and finally decided that going to a flex fuel tune with a sensor is the right thing to do. It gets rid of all those guessing games on what is my content, so right on, good for you!