Sorry I haven’t had time to post pics yet. Yes there is a space underneath the nose for the muffler on a 2 stroke, I will try and get some pics up tonight. My engine has been on the test stand ever since iv had this plane so I haven’t had a chance to see if the cavity for the muffler is big enough for the muffler on my gms. It looks like it will be close if not then I will have to do some moding. You can see the muffler cavity in this pic.