if you can, I'd highly recommend over powering your stik. Then you can experiment with hovering, etc. I'm using a OS 95ax in my Great Planes 60 sized stik and it's the most fun one can have this side of the law. I recently stalled and crashed it by flying too low and slow. Thought about buying a different model but I just couldn't stand not having a stik, so I ordered a new fuse and it's all back together.

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DenverJayHawk,
I am with you I have put a ST 91 with a pitts style muffler on mine. I have yet to finish it though as I had to go back overseas to work. My question is how nose heavy did your end up with the OS on it??
Derrick