Originally Posted by maestro300
ttt ... I'm about to head home and work on this. Does anybody know what the point of the metal rim is on one side of the donut? I'm not sure if it matters as to which direction it's installed. I dont want to make a mistake and have to pull it out once again.
that feature is just there to facilitate assembly on the line. Since the gasket is held captive, the assembler does not need to keep it center when the exhaust is being installed. The donut itself should be symmetrical, so install the flange in the exhaust pipe.