OK guys - I'll start a fight! I'm looking for experiences of users of Moki 1.80's and OS 1.60's in deciding which to replace my Saito 180 in my Sig Extra 300XS (about 14 lbs.). The Extra is to see lots of time in practicing IMAC with low emphasis on 3D (some 3D ability would be nice however but I have other A/C for that). No complaint with the Saito's running - just want a bit more bite with less fuel. I see that the Moki's are running on low and no nitro - how about the OS? Engines' performance and prop sizes in similar size and use airplanes only would be appreciated.