A DSP5 tune isn't 5 completely differant tunes, it is one tune with 5 different layers to it. When you load the tune you are only putting one tune file in the truck but that file has different levels. You could ask for 5 different tunes to be built. When you get the tunes make a copy of the original file and save it somewhere and never alter it. Use the second copy to make your own modifications to. You can save as many copies of the original file and alter them however you would like. You can then select those different modified tunes to load to the ECM. You can only load one tune with its 5 different levels to the ECM at one time though.