Stihl Muffler Cover (Dual Port) for 066, MS 650, MS 660 Chainsaws
QS 1122 140 0800
OEM muffler cover from Stihl. Replace your standard muffler cover with a dual port cover. This will allow your saw to breath easier and should give your saw increased performance over a standard muffler. Cover is installed by simply removing 4 muffler screws.