Bluesaws- Pro Flow foam filter .. in our opinion this is one of the nicest foam filters for an MS660 made. The ABS plastic is molded beautifully is strong and durable. Comes with two foam filters.
Note: we also use this same filter on MS440, MS 460 and other saws using that same HD2 filter. The included ms660 rear cover will not fit either of those saws but the foam filter will. We mentioned this because it gives the option of running a foam filter in dirty dusty conditions or for performance reasons. Obviously use on any other saw than a 660 will be done without the rear plastic cover as it will not fit any other saw then a MS660 or MS660 clone
***Foam filters MUST be oiled with foam filter oil before use. ***
Upgrade MS660 Part- Increase air intake
【Solid】 - Made of high-quality ABS material, can withstand long-term use
【Easy】 - Upgraded design, easy to install, remove and clean
【Compatible】 - For Professional Stihl Chainsaws with the HD2 filter, Models MS660, MS660C-M.