Okay Guys..I need your help here. I have a bone stock 04 yz450f that I have raced for two years. I am finally at the point where I want to throw some mods at it and I have information overloaded myself. I am 38 yrs old, 6ft 4in and 210 lbs. I run in the plus 30 amateur classes although I would classify myself as a top 10 novice. I want an exhaust system and a flywheel weight that will mellow out "the hit" a bit. Can you give me any real world advice on what you think would be a good combination? Thank you in advance for your feedback!