oem muffler dissection

[OTA'sTOY]

Originally Posted by 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.

quick question you said it was stuck correct. so the first pic is after you beat it open and the second pic is the before?
if so ever thought that maybe the flap would open toward the rear of muffler instead of towards to front? jus wondering