Started doing some the free mods to my 03 wr 450 last night, but haven't rode it yet. I ran the breather hose to the airbox and unhooked the gray wire so far. Planning on others as time permits. My question is after unhooking the gray wire, will I need to change jetting for any reason? If so, may go ahead with some other mods and do it one time. I have a fmf powercore 4 on the bike and it has been jetted for it, and the trottle stop has been changed, but thats all previous owner has done, that I seen. Also, which would be the best way to go, james now, av now, or power now? Going from 2 smokes to 4 strokes has been great, now just wanting make it even better! Thanks for help?