I played with the TT .10 and .15 and just could not get any performance out of them at all. Not even average. Tried new heads, bigger carbs etc. I just put in an FP and LA and they really woke up. I think I will make a few manifolds when I get some time. I like that way. Very simple on my turret lathe, and only a little trouble on the mill. Maybe some mousse can mufflers or some kind of pipes are in the future. Too bad the wing folded up on my little guy, I have nothing left to put the .10s in.