I decided to go with the MT Extra 300. Now I have to decide which engine to put in it. I have an OS 25 FSR ABC from when I used to fly. The engine has very little time on it. The other choice is a Saito FA-45 which is also in great shape.

I originally thought I would use the Saito, cause I love how quiet it is when running. However, I worry about the weight. The OS has more power, is significantly smaller (easier to hide in the cowl), lighter, and generally simpler to operate. I've also discovered I can get a tuned & muffled pipe for the OS, which would give even more power. Anyone with experience with this plane, or this question, who can help me decide? If I go with the OS is it worth getting a tuned pipe? I also asked this question in the engine forum.

Thanks for any advice.