"Ported muffler"

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I assume that will act like a car muffler. More open so fast exhuast out--faster air in= more HP?
 
Husky 371 and 372 saws run very strong strait out of the box. I would assume the same holds true for the 362 and 365. Do you really need a ported muffler on these saws??
 
Would you consider it a stock muffler...or, say, slightly modded?

It does flow just slightly more than the OEM stock muffler. It also does not have the spark arrestor so it is not legal to use for a contractor working on Federal land, and some state lands.

The walls of these mufflers are thicker though and that's a benefit to longevity and heat dissipation. I like them.
 
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