[ryanmt]

the eeprom contains the entire map, rev limit n all.

If its even slightly different to the original map (not the tables themselves, but size, location and checksums etc) then it probably wont start, this is usually indicated by having all the symptoms of a totally dead ecu. An example of this is the 1ap.81 and 1ap.41 have interchagable eeproms, but the 1ap.10 will not interchange.. even though its the same ecu internally with the exception of a few extra injector drivers for the gti6

If you remove your transponder box before fitting you dont need to worry about trying it with the immo either way.