I had one of the first Seagle Edge 540 when they first came out and I put an OS 91FX 2 stroke it it and it flew very well for aerobatics, I've even heard of people putting a OS 1.20 in it, and its like a hot rode then. I think the OS 1.20 weights about as much as the OS 91FX, The OS 91FX worked out great for my needs.
NEDYOB