I think the ys 45 is still stronger, than say a os 46fx, because they both were in the air and the ys was for sure stronger.

I just need to tune it up so it will run better o the stock pipe, and was wondering if anyone has done this. I think it will be too "peaky" on the Sukhoi for the type of flying I want to do with it. I have run the tuned pipe with this engine on my ultra stick, lots of power and speed. I like the motor, I just want to use it without the tuned pipe.