What bothers me about this project is its apparently your first glow airplane and the fact you have choosen to post in the beginners forum. I cannot think of a more inappropriate first glow airplane and even worse doing it as a glow conversion.

To be honest a far more practical engine for this airplane would be a good .15 and more likely to contribute to the airplanes longevity. While it may not be a blood curdling hover monster it would be a much better step along the way to building your skills.

Having said that if you insist there is only one combination I would use with that airplane, An OS .25FX not a .32 or .36 and if spell binding power was desired then equip it with an Ultra thrust quarter wave pipe from Performance Specialties in Nevada like these. It is a true quarter wave tuned pipe, not an empty can muffler like the tower muffler.

John