The 441 is case fed like the 362. 4 small ports around the cylinder extension are the choke point in the intake tract. I opened these ports as well as removed the divider in the intake boot and cut off unnecessary cylinder extension hindering flow. I used a West Coadt Universal port to get WAY more flow out the muffler. All in all its a huge improvement.
Негізгі бет Stihl 441 after porting and muffler mod. Full length with port discussion.
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