I notice that my 445 would get really hot after making a few cuts. I assume it was set lean from the factory so I drilled three 3/16" holes in the muffler and backed the H screw out a 1/4 turn. I can't say for sure if it cuts any faster (stock chain) but it sure runs alot cooler. also, the small holes didn't seem to make the saw any louder. I wear ear muffs anyway ![lol ;lol ;lol](/talk/styles/default/xenforo/smileys/lol.gif)
![Husqvarna 445 mild muffler mod Husqvarna 445 mild muffler mod](https://www.hearth.com/talk/data/attachments/144/144077-76275669c10fbec906bcc866de726210.jpg)
![lol ;lol ;lol](/talk/styles/default/xenforo/smileys/lol.gif)
![Husqvarna 445 mild muffler mod Husqvarna 445 mild muffler mod](https://www.hearth.com/talk/data/attachments/144/144074-d5a5d7499c94dfbf79f37718983f7859.jpg)
![Husqvarna 445 mild muffler mod Husqvarna 445 mild muffler mod](https://www.hearth.com/talk/data/attachments/144/144077-76275669c10fbec906bcc866de726210.jpg)