Midas Muffler (which probably has a different name now since they do things other than replace mufflers). Midas once offered a "lifetime warranty" on auto mufflers. The trick is that the warranty covered only the muffler itself, one whose wholesale cost was pretty cheap, judging by its short lifespan. My mother was replacing the muffler every two or three years, paying for the labor each time. Midas may not offer the warranty any more. I wouldn't know, because I've never taken a car there after Mother's experience.