Here is the part number for a dual dog kit that has a ceramic roller at the bottom. The dogs aren't huge, but they are bigger than the wimpy stock single dog.
Stihl part# 1135 650 7750
Ask Squishy how it works... they are on the saw I sold him.
Gary
Stihl already makes the facory dual-port mufflers for the 046/460 and the 066/660. The one for the 046/460 will also fit the 044/440.
You can order them right at your local Stihl dealer.
The other saw brands I'm not sure about.
Gary
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