I just purchased a 254xp 3 weeks ago. It was in great shape, just had to be cleaned up. Mine says 254xp on the air filter cover, on the recoil and the metal tag. The only thing I don't like is the swing out choke lever, but not a big deal. Lots of good info on AS about this saw.
I did the search on this site and modded the muffler which is just a can. I opened 2 of the four holes inside the muffler and opened the throat in the carb and she is a little screamer.
Just wondering if anyone is running 3/8 vs .325? mine came with a .325 18". I think it could handle a 3/8 20". I know a .325 20' would be no problem the way this saw runs. Great little saw.
Cadenhill