Originally Posted by
jester_s1
...... thermal expansion of the aluminum.....
And here it is , the reason I've never lost a muffler . As we all know they expand & get loose with heat . I run an engine till it's good and warm and while it's hot I tighten it (not to the point of stripping of course) .
I never used any kind of gasket , even when one was supplied , for the whole squish/loose reason ...