I recommend a Gnarley Torkue (woods) pipe, Boyesen rad reeds and RB Design carb mod. Those three combined will make your bike really come alive. I still have some issues with my 99, but it´s due to the Kips actuator shaft, I think it sheared a pin in the clutch cover, but it´s only noticeable in the midrange. I´ve done all these mods, I LOVE the way mine works for me. It has the torbue of a 4 stroke and the zing of a 2 stroke. Oh, one other thing, if you have access, try to run gas with no ethanol. It´ll keep longer and runs much better too and it´s only a few cents higher and well worth the cost.