The ECM will arrive without a tune on it.
If your getting it flashed with an aftermarket tune (pcm4less,werks,etc...) this isn't an issue as they will flash it with their own tune.
However if your just keeping it as a stock spare, you will have to get the dealer to load it, though I suppose one of the aftermarket guys could probably load it with a stock tune as well...though I highly recommend getting it tuned
