Sulaco,
Yes sure apparently it works fine and many have done it, A small part of me is sceptical as to weather its as good as maps built for the 5.4

AMG do replace the C43 ECU on the gate-shift and touch shift C55, I have both the ECU numbers for these they are not in EPC...My assumptions are that it is map related.

I'm using the CLk55 ECU because I believe the maps are identical to the C55 seeing as the cams and exhaust are identical, but also because it accepts the touch shift system as well =)