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??
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.