RE: My Embraer T-27 Tucano first flight!
My solution to the muffler problem was simple: fit the muffler (in my case two stainless steel mugs brazed together with inlet at one end and exhaust exiting the fuz. just forward of wing root. My engine is a 30cc gas engine. Air retracts fitted, and air whistlers (?) to siimulate turbo whine. Performance is awsome!