Are you planning to get the O.S. .15 LA? As far as I can tell from Towers, it uses the #871 muffler with a baffle. My O.S. .15 FP uses this same muffler, and is the quietest engine I have ever heard. It's definitely quieter than a brushless electric.

I've owned quite a few engines over the years, and the .15 FP is my favorite.

Robb