Hello, new to this EFI live stuff what's the difference between the black and the blue V2 box. I'm looking at buying a black V2 from a guy and he has 2 lic with it never used he said the box was updated last week and he used a lic he had for his truck to put it back to stock. He also has a few tunes he got from someone and some he did asking 800 for everything shipped. His truck is a LMM and so is mine is this a good deal and do I need to worry about anything he seems like a good guy just don't know anything about this stuff and I really don't know how to make my own tunes. I have the edge race tuner now and my DPF is gone what should I do HELP please. Thx