I have used bisson mufflers in the past but recently bought one of the "Q" series slimline mufflers, it looks every bit as good as the bisson with slightly more internal volume, and very light. This is worth taking a look at.

The tatone mufflers are a old type design IMO, cast from aluminum, heavy, low internal volume, loud.

http://www3.towerhobbies.com/cgi-bin...&I=LXUNU2&P=SM