I'm not sure which one it is, it's all still in with the box of stuff I bought with the plane. One of the YS LS's I've ran before was propped with a 11x11 for speed, but a 12x10 coming in at 10,500 is pretty close. It's all what your looking for., and pipes cut for. The 11 x11 will come in closer to 11k.
I've been really enjoying my Nova Rossi's and may get me a rear exhaust for the Arrow when I ever get around to setting it up.
Here in the Southeast, the SPA is very active, and my Favorite stuff is still 2 meter flying, but do try to hit all 3 pattern type events which usually has me doing 17-21 contest each year, no kidding.
As long as its pattern flying, I'm In !!!
Check the SPA stuff out at seniorpattern.com, its just getting better and better.