RE: .91ax?
I hope they do. I have the 55 and love it.
I wouldn't touch another FX engine if it was given to me though. They are the worst crap on the market. I have sent 4 back to OS that they refunded and have one in a plane I bought last year and ran it one time, it has the same problems that the other 4 had and it is gone as soon I have the chance to pull it.