Individual cost yes but if the process does work as claimed, with fuel prices what they are and the growing pressures of environmental concerns from automobile pollution you can bet this will become an industry in some form. Besides, there are companies out there that cryo treat metals for industry so the individual can have it done at a cost that will, over the course of a few years in fuel saving and life of component savings, probably more than pay for itself.
Regardless, good to see the average guy thinking outside the box because in the end this is where solutions come from.