Thanks Brian, appreciate any info I can get on this stuff. Unfortunately, I don't see anyone posting like the do the S/N & date for 10 mms, the 046/460 stuff all seems a lot more vague.
That said, I know if you get a saw with a factory dp muff, they are supposed to be runners, and I think the SN cut off is somewhere around 138******, but that is just speculation on my part.
I'll tell you what, I am also shocked how strong my MS440 is w/o any port work (just at home mods). It clocked 3 runs on the dyno of 6.7/6.8 Hp. Not bad for a 70 saw that is not ported!