Logan,

The 70 is the engine for this kit.... if you have a 46, I would consider it but would start saving for a 70..... the cowling does not fit inside cleanly; I made a headcut for the top and then used the standard muffler from the OS70. I will take a pic if I go flying tomorrow and post it. You will really like this plane... flies great but do not, I say again, do not go higher than suggested on the elevator travel.... I did and almost lost it on the first flight... I had my hands more than full. After I got her down, I put it back where it belonged and the rest is history.

Enjoy.....