Two questions 1. I have a Stihl MS 441C with a 20" bar. I'd like to upgrade it pretty substantially. From my reading here, it seems like the best things to do are a. Drill muffler b. Re-tune carb c. Add high flow oiler or else mod oiler to flow better d. Upgrade dogs e. Buy a 25 or 28" bar What do y'all think, and, could you possibly point me to specifics on precisely how to do these things? Or, in the alternative, do y'all know anyone I can ship this thing to to get this done? I don't trust my locals. 2. I have a Stihl 310 with 20" bar. It runs like crap, but I think it's because my bar is toast, specifically I think the tip sprocket or whatever you call it is bad. It spins all right, but it seems like the teeth of the sprocket are too worn down, and I think the sprocket may be bent to one side. As a result, I never get a good chain roll. I've attached pictures. --- Thank y'all. I'm a complete novice, so feel free to tell me everything I've done wrong and how bad my ideas are!