As others have mentioned, 82 db is really low, although of course it depends on how far away and where it is being measured from.

At our field 95 db is the limit and lots of stock engines don't make it. I think they meaure it about 10 feet away, and they measure the sound from all directions. Most of the large motors, particularily the gas motors don't meet the limit, some guys have spent hundreds of dollars trying different mufflers & props to get to the 95 db limit.

I have had my OS 46 FX and OS 61 FX measured for sound, they registered a peak of around 89 db. They use the stock mufflers (i.e. with baffle), and are very quiet. I have found that the large diameter, low pitch APC props are pretty quiet.

Malcolm