i just got an 2001 raptor it has a pro design filter system and gyt-r silencer i would like to get more mid to top end with out losing much on bottom what do you guys think would be the best path to take i know a good head pipe will help but witch one and i have see 686 kits and 700 kits any one know the differance and witch would be better a couple of my riding buddys just got new 450s and i would like to at least keep up with them if that is posable them things are fast in stock trim
any info would be great thanks

 

Try changing your front sprocket. You have 13 tooth front sprocket. Go one tooth smaller and you get more take off, but u lose a little top end. One tooth bigger you get more top end, but you loose a little bottom end.