I am replacing my exhaust tips and found this thread looking for instructions to remove the diffuser. The heads-up about the two hidden screws was a time saver. Thank You! I ended-up using a small alligator vice grip pliers to grab those screws from the threads and give them each 1/2-3/4 turn to break tension. From there I could easily unthread them by hand. Got the diffuser off in about 20-25 minutes....quite a lot of small gravel back there! Hopefully the diffuser will go back on just as easy.