Yeah I noticed that when I got the 460. It will resist a pinch way more than the smaller saws. id like to muffler mod it but I'm afraid to because it runs so good and I don't want to muck it up. Lol.
Just remove the muff cover and drill 2 1/4" holes on the high right side (above where it clears the saw). No deflector needed. Also make sure you pull the carb limiters and make it a bit richer, usually about 1 full turn on the Lo and 1 & 1/16 on the Hi. If you don't like it, just get a new cover and put it back to original.
If you do like it, you may want to advance the timing a bit next.