I agree with the fact that the stock chain sucks. Thru the chain away before I ever took it out on the track. I do have a complaint with the exhaust system. I literally was going thru the packing every weekend. I tried 3 different packing kits for a month. All destroyed after a weekend of riding. I modified my 06 exhaust of my 450 and it has lasted to this day. Oh am just last weekend my bike died electrically. Did some test and found the stator to be bad. To bad the warranty wasnt 45 days instead of 30. Never had any problems with my 04, 05, and 06.