Thanks for the reminder Dale. The thing that should have tipped me off much earlier than it did, was when Elwyn was taking pictures of my Nobler flying during practice at VSC, and told me that I had the quietest Fox 35 he had heard. But no. I did the usual stuff and cleaned the spray bar, cleaned the tank, checked the back plate gasket for leaking, and not once looked at the muffler. Now I am paranoid and look at the muffler holes every other flight. LOL.