Efi live is awsome. Box tuners are coll but a bit touchy. The PPE programmers build huge power fo a boxed tuner. But be carefull of these with other mods it doesnt like it to much. The cool part of efi live is you can tune it to the mods you have done, turn off that Egr crap, lower egts, and out do the comp. Just remember that you pay for what you get so with said $ 500.00 is the norm if you have the software. If not an extra $100.00 is needed for a licence and they have complete control of your tunes not you.