Here is a link that I found a few years back that may help with building a pipe, it shows basic two stroke operation with pipe function toward the bottom of page.
http://www.vf750fd.com/blurbs/stroke.html
I had contacted Stihl by their website asking about the MS441. I asked if it was discontinued or not, the reply I received on 6/13/16 was as follows: The production of the MS441 series was halted in early 2015 due to assembly line issues. This model is expected to be back early 2017.
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