Hello everyone! I'm going to shotgun some answers here.
N55 support is a little ways off, so no ETA at this time.
Euro support is something we will look into once we have a full product offering (All the stage maps are out, ATP is out, ATR is likely out, etc) for the N54 in the US.
Currently only Stage 1 will be supported. Stage 1 is tuned for completely stock vehicles, however works well with intakes/panel filters/cat-backs. The stages beyond 1 (downpipes, FMICs, Meth, etc) have not been fully defined, so I can't let y'all know what the specifications of the allowable modifications are beyond stage 1.
I have a Alpha AP heading out to work on/verify 'ix' support.