My PM Strega with a TT PRO .61 w/Ultra Thrust pipe is a great Silver Class Warbird. I just built it straight and it is a runner. I see lots of them at the RCPRO Warbird races and they run great in all three classes but, I think for Gold they have to be reinforced a bit in the wing and the horizontal stabilizer. My next three are all Stregas and the last two will be modded to look more like the real Strega and one of them will be a Gold Class plane.