JumboJet; worth checking carefully on the 337s/STCs.
I have an N-reg DA40 with GFC700 autopilot: the GFC700 is an STC approved by the FAA. It may not be correct (or may no longer be the case) but when I bought the aircraft I was told unequivocally that this autopilot was not approved on the DA40-180 in JAA land; only the KAP140 was. Therefore at the time if I was to put the aircraft onto the G-reg I would actually have to try to get approval and pending that have the GFC700 autopliot disabled...