I modded the muffler on the 'ol ms310, and tuned it by ear. A hint of "burble" at WOT and smooth in the cut.
For chits and giggles, I put the tach on it and it it pulling 13k with bar and chain ( no load). Does this sound right? Has great power in the cut and dosent bog. This thing really screams now with about 10 min worth of work.