Have you ever seen the exhaust outlet on a Stihl 260? It’s about the diameter of a pencil… I think restrictions are their go-to for reducing noise and emissions.
They’ve clearly been doing some work with acoustics.
Most of the newer Stihls have baffles the twist the exhaust after it exits the cylinder. When there wasn’t enough room to accomplish their goal, they started the twist in the exhaust port (462).
The noise canceling effects of colliding acoustic waves are being taken advantage of. Most of the newer mufflers place the outlet as far back in the can as possible. They are also flowing more and making less decibels.
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