hhhhey i have a 00 400ex i want to do so thing to it to give it alot more ***** and i am on a little bit of a budget . i mean i am only 16. so wut do u think i should do (440bore kit, stage 2 hotcam, new air box k&n fliter with perchager lid removed) and an other thing how reliable will it be??
or just go with a streetbike engine i heard some really good things about them but i never really heard how much that would cost?? and how reliable they r???

 

1st get a full exhaust and pro-flow intake. then see if u need more power.

 

i have a full fmf setup factory4 and a white bro. airfilter