BOTH MY STICKERS ON MY MUFFLERS HAVE BURNED OFF. FIRST THE SHORT PIPE TURNED BLACK AND FELL OF LEAVING THE BROWN SMUDGE OF GLUE WHICH TURNED BLACK AND OZZED DOWN THE MUFFLER LEAVING AN UGLY STAIN. ANY BODY ELSE HAVE THIS PROBLEM? I HAVE THE QUIET QORES IN. DOES THIS MAKE A DIFFERENCE? THE QUALITY SHOULD BE BETTER THAN THAT!