Here is my Pizazz, that is for sale right now with a YS63 which is more then fine. A YS91 has got to be overkill for that plane I would think. I see the 91's on UCANDO's which even then is a more then powerful engine and it's much bigger.
http://www.rcuniverse.com/showthread...3548&forumid=2
I am only asking $350 which is a steal for what it has on board..