Husqvarna 392xp project, update on muffler mod and plans for the air filter

finished the muffler and getting very close to putting this beast together. a little more work needs to be done which I will post in the near future.
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[@Metalandwoods_longlostdentures]

How did you come up with 92cc? A 390 is only 88cc. a 55mm bore on a 372 crank (36mm) is only 85.5cc.

[@HillbillyHandworks]

It is a 390 big bore, so it is 57mm and when I did the calculations with 57mm bore and 36mm stroke it was a bit over 91 so I'm calling it 92