oem muffler dissection

[larryn2o]

i cut up a factory muffler this week , to see how it is made. it had 2 small "glasspak sections and a 180 bend in the pipe . not bad for flow. the bad part is a center divider with a small square door. it is spring loaded and was stuck almost shut. had to be beat open, this is after only 40,000 miles .

one could take a hole saw or large drill bit , make 1 hole in the rear of the muffler and perforate the divider to gain more flow. then patch the out side for a stock appearance.