Stihl 440 Magnum

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Dual port muffler cover, or a mod to the existing cover. Beyond that, it'd be internal port mods. Depends on how much power you want/need/can afford.

Do a search on here for "044 muffler mod," and you'll see what I'm talking about.

P/N is 1128 140 0801 at your Stihl dealer. Should run you about $30.

Welcome to AS.

Jeff
 
Like what was already said dual port is the easiest and cheapest just don't forget to have the saw retuned as the extra flow will make for a leaner condition which can lead to problems.
 
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