I have a 2009 Speedmaster and the "cat" is in the muffler not the header pipe. Remove the muffler and about 4" in is the cat. It looks like honeycomb, get a small hole saw hole saw, about 1" dia and drill into it, its about 2-1/2" long and is made from a coiled looking sheet of steel. Get a bigger hole saw that just fits inside the muffler then drill through again. break the parts up small enough to get them out of the hole. if you use a hole saw thats big the pieces are awkward to get out of the hole. you need to support/hold the muffler still asit wants to grab and twist. I wrapped my muffler in rags and slid it into the vise and lightly clamped it enough to keep it from rotating. Happy gutting!
