I just pull out my old Husquarna 2 & 5 Series service Manuals . The designations are as follows , XT = Strato engine design (X-torq) W = Full Wrap handle ( Only on Pro saws ) G = Heated carb (& or handles) OE = Original Addition NE = New Edition ( Marketing reasons) EL = Electric saw T = Top handle saw SE = Special Edition XP = Extra Power , although i have also heard this pro grade unit referred to Extra Performance . Anyhow , the jest of my comment is that the SE model designation was a predessessor of the XP Both were & always have been the elite Commercial ( Professional) grade or Series saws in Husquarnas line up . Actually , back in the day saws were either referred to as Commercial or Homeowner saws . Then terms like Consumer or Prosumer became common . I Prefer the old designations pretty straight forward !
Open & Closed port refers to how effective flow over the piston crown ocurrs via the transfers & much less turbulence is optimal. Every closed port saw I have run was day & night within horsepower & acceleration , over a comparative sized open port configuration . The 266 vs the 268 is a perfect example . Many saw builder prefer the closed port configuration since it provide s much more metal to work with or fresh canvass . Pretty well all recognized world class homeowner saws are open port configuration today , not all but most !
I got a cheap homeowner saw and it is closed dual quad port.
. The MS is just the Stihl German dna venaculiar "Motorsage" or roughly translated "German Saw" . Whats the CS designation within Echo's line up ? ...i think you can easily handle this translation brother ! 
What to
What u don' t appreciate the "Farm Boss" & "Rancher" Prosumer Marketing !
Craftsman is tricky because they don't make anything....everything is subbed out In tools. They've had MANY subcontractors make them tools over the decades. As far as their chainsaws, I never asked around who was making them. Should be pretty straight fwd just looking at them.....who made them.
Actually no Nate , Jakes saw is a pirated "Zenoah / Kioritz" Designed Engine" . Very effective engine design parameter ! The rest of the chassis may be questionable but not the engine brother !
Don't need Spike to advise me , I have run most of the legendary saws , I was there , and so were you oldtimer.
. However , your correct the man knows his saws without question , as do numerous much younger individuals on site . I originally stated there were numerous individuals onsite that could & should contribute to these discussions , to assist Nate in this massive endeavour . Especially , within today's more modern units . There are at least 4 world class saw builders on this site & another half dozen bike & sled engine builders , which is where I learned life's lessons . Although , I have only ported one 357 xp , I have repaired & torn down numerous saws for routine repairs & general mtce . In closing Kevin your absolutely correct , that you get what you pay for much more often than not brother !
Nothing wrong with a Saturday nite special saw , with a purge bulb for one to twice a week or year trimming or lite bucking . However even my daughter could identify a 445 or 445e as a weekend warrior saw at best !
