Norvel, vs Cox, vs AP Engines
I've used high temp silicone to seal a couple of Norvel mufflers. What I did was clean the muffler with alcohol and put some silicone on it. I then covered it with a small piece of wax paper, clipped the muffler into place and let it dry over night. The next morning I removed the muffler and the wax paper and trimmed the silicone with an Exacto knife. This left a silicone gasket attached to the muffler