I'm setting up one of the 10cc engines for a friend. I have many years experience with larger gassers but this will be the first with these smaller gas engines. Has anyone used any sort of Pitts muffler on this engine? I can make the stock muffler fit but it will require considerable cowl cutting and an extension to get the exhaust out of the cowl. A Pitts would resolve all these issues. I'm open to any suggestions.