On the 200T, simply pulling out the screen insert works quite well. I've pulled a couple mufflers apart and wallered them out further but it didn't make much difference except for noise.
I don't have a 346 here at the house to show you but here's a picture of a 372. I actually just replaced...
The Huskys are even easier. Many of them have a bracket across the front of the muffler to hold it in place. You can just cut a hole in the bracket and a matching hole in the muffler, then sandwich a screen in between. It even looks 'factory' to someone who may not be familiar with Huskys.
It's as simple as making the muffler outlet hole almost as big as the exhaust port on the jug. Either make the original hole bigger or add a second hole. Then adjust the carb a little bit richer to compensate for the increased airflow. That's it, it's just that simple. Anybody can do it in 15...
I'm not sure there would be much of a market. Those who understand small engines enough to appreciate the need for more airflow are fully capable of drilling a couple holes in the muffler and adjusting the carb. Those who aren't comfortable doing that are the same ones who won't buy an...
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