I replaced my stupid catalytic muffler with the OEM non-cat muffler and put the exact part numbers in this thread. Hope it helps someone, makes a world of difference in how well this saw performs!
How it will be with ALL new saws sooner than you can imagine. Glad I don't live in Canada, I bought the replacement non cat muffler from Saw It Again for 12 bucks less, shipping included. I would suggest taking a Dremel to the deflector as well.
I suspect there is some more flow to be found by dremelling, but it's as loud as I care for it to be now. I use it often for clearing blowdowns and opening up shooting lanes around my tree stands and don't want to announce my location to the whole world.