In defence of the 450 mtow if that is correct, that would be a carry over of the European registration system, thus the aircraft in theory would be capable of much more, potentially 544 or 600 mtow. Not that that makes it right if it is the case of course...
Wally, was in a twin on the weekend, full up, I suggested to the pilot that it might be unable to maintain height on one (old) engine. He replied, "and how is that different to any other Piper with only one engine?"
Oh dear, I heard a rumour that he rego expired in 2008.