I must be missing something. Why would you want to remove those 4 bolts on the top of the muffler to the hanger? When I did mine I removed the two bolts from the hanger to the bracket on the back of the trans. Since the bolts are captured on the hanger you don't even need to back them up. The muffler hangs on the bolts until you're in position to handle the muffler. Remove last and install first, easy. I didn't even have to remove the cover over the shift linkage.
For clarity I'm talking about the bolts that attach thru the 2 holes on the top of this bracket.
