Hi steven4him,

Well I started with an OS 46 on the Funstar and replaced it with the OS 50. It was like flying a different plane. The Tower muffler provides way more power on the 50 and has been a real hit at my field, as a bunch of guys have purchased same for their OS 46 - 50's. I use a 12.24 x 3.75 prop which spins perfectly with that nitro and I have even flown with less and it's been fine. The thing that I notice about the Tower muffler is the responsiveness over the standard muffler. It's almost as good as the much more expensive YS 46. Rapid responsiveness is what I have found has made learning 3D and other aerobatics so much easier

I'm also sure that other motor combinations would be good as well but the combination that I have mentioned has worked for me. That's all I am commenting on. The power to weight is excellent and the plane flies well on standard 539 JR sevos.

Good luck with your choice.

Lang