I understood that the husqvarna 268 xp was a professional saw, untill I went to the husky dealer and was told that they never made a 268 xp only a 272xp because the 268 was a homeowner open port version, and the 272 was the pro model with scavenged loop (closed ports). Now here is my problem, I have 2 husqvarna 268 xp saws that say professional on the side of them. Did they make 268 xp's with open ports? I have a 28" bar 3/8" .050 on my saw with a full skip, round ground chisel chain and seems to run it fine, not often is the bar buried, and I cut mostly alder maple and fir. I also have the oregon power match system with a 7 tooth floating rim sprocket and was curious if it would cut faster with an 8 tooth or would I loose to much on the low end torque? The muffler is opened up and the saw seems to have good power. One of my 268 xp's has a W on the black ID tag. I have heard several versions of what this is. I was told it means wrap handle and also west coast version. Is the full wrap handle the only difference? I noticed this one has double dogs and my other 268 xp has only one, power seems to be pretty equal. Thank you for looking and I am sorry that is a lot of brain picking at once, but this place is filled with people full of information (hopefully semi correct information).