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Muffler Mod on a Stihl MS391

Started by bendjoseph, January 21, 2012, 03:07:58 PM

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bendjoseph

January 21, 2012, 03:07:58 PM
Has anyone done a muffler mod on the Stihl MS391?  Was it hard to do?  Was it worth it?

Cut4fun

#1
January 21, 2012, 05:45:45 PM
never seen a 291 311 391 on the bench yet. Only 290 310 390 mufflers. What does the muffler look like?

The old ones about 30mins and carb retune was good for as much as 23% quicker cut times.

They are restricted that bad. JMO.

bendjoseph

#2
January 21, 2012, 06:23:20 PM
Looks like two retianing "caps" on the front.  Small exhust port on the left side.
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