Ok, i am still trying to find things to do to my bike to make it have more power. I have a couple of questions for anyone that can help. I have a 2000 WR 400, i have a FMF Q pipe, bigger header, grey wire cut, YZF timing, and i think that is it. Now i have been reading about somethings but i don't really understand any of them. Like a powernow valve, or putting in a 450 cam? can someone please help me or maybe tell me what else i can do for my bike. My brother has a 2002 YZ 250,his bike has a couple of mods but i need to give my bike a little bit of boost before i put him on my list for my next victim. Can someone help Thanks in advance.