I'm converting a BH P-40C to P-36 configuration. I want to use a 20cc gasser. Weight might be a factor. Looking for a lighter one. The Zenoha G20 specs show a weight of 41 oz with muffler and ignition. The RCFG 20cc spec show weight of 38 oz with muffler and ignition. But I can't find a pitts type or rear dump muffler for the RCFG. Any other engines out there or suppliers of mufflers for the RCFG 20cc???