Sorry, maybe live was the wrong choice of word. I meant that remapping (at least how mine was done), is they solder a cradle where the old EEPROM was (I did this myself, saved a bit of coin) and use a romulator (chip with a cable) to tune, once happy with the tune they burn the maps to another EEPROM and chuck it in.
Nistune is tunable through the consult port, you don't need to open it up and remove chips.
I use Datascan on my carpc, cost about $35 from plmsdevelopments.