Muffler mods. ? Is it something you do to your existing muff. Is carb tuning necessary after? My #1 go to saw is a stock 044. Keep in mind that for 20 some years all that I have ever done to this saw is pour oil & fuel into it, normal bar & chain stuff, and replace the handle/tank assy. And obviously I am completely satisfied with the saws performance, but now I wonder what am missing?